We look at pictures of Kate Middleton over the years - from her childhood to becoming a princess...
Well this is a first for Kate!
During a visit to Wimbledon in July 2016, Serena Williams posted an adorable video of herself and Kate on Snapchat, exclaiming ‘I’m with royalty!’ Whilst the Duchess looks a little confused at the concept at first, she soon gets the hang of it, sharing a big smile for the camera.
Both William and Kate are known to be avid tennis fans, but Kate also revealed to former British number one Greg Rusedski that George is already following in their footsteps, and has taken up the sport at the age of just 2.
‘She talked about George, her little boy, playing tennis,’ Greg said. ‘He’s got a racket and he enjoys playing tennis, and obviously she plays with William, so they obviously enjoy the sport very much.’
Life has changed a lot for Kate Middleton over the last few years. The once normal girl has been transformed into a princess (well, Duchess) and become the nation's sweetheart.
Kate was just a normal university student when she met Prince William and her life turned upside down. She has weathered a very public break-up, a royal wedding and and gave us an adorable Prince and Princess. One thing's for sure, Kate's emerged as an elegant young woman the public love!
And to think it all started with this adventurous 3-year-old little girl!
Here's a snap of Kate taken from her family album at just 5 years old - cute!
This pic of Kate Middleton modelling a see-through dress for a charity fashion show when she was a student has become famous. The dress has just sold at auction for £78,000 to an anonymous buyer.
Kate Middleton looks happy while at the Game Fair at Blenheim Place. Her relationship with Prince William was in full swing and begun in 2003 while the pair were at university together.
Kate Middleton graduated from St. Andrews University in 2005 with a 2:1 in History of Art.
Princesses make their own way to the gym too! Kate was pictured cycling to her local gym in a skimpy top and shorts in July 2005.
This is one you never thought you'd see! Kate Middleton taking the bus? She boarded a red London bus in September 2005 to go to a job interview.
Kate busts a few moves on the dance floor at Richard Branson's party in June 2006. But wait, that's not Wills she's dancing with! In fact it's his best mate, Guy Pelly.
Kate Middleton looking every inch the lady in red at the Sovereigns Parade in December 2006.
Princes Harry and William and Kate Middleton enjoy a day watching the rugby in February 2007. Harry seems to be bored though!
Kate and Wills take a skiing break together in Switzerland in March 2007. Shortly after this pic was taken, they were said to have broken up for a few months before getting back together.
Kate Middleton looks excited watching the races at Cheltenham Festival. We're loving the beret too, Kate.
Kate trains for the Sisterhood Challenge rowing event on the River Thames in July 2007.
Kate looks squeamish as she watches the boxing at a charity event with friends in June 2008.
Disco diva Kate busts a few moves on the dance floor for a charity roller disco event. Check out her sparkly top and shorts!
Kate looks gorgeous in a grey dress by her favourite designer, Issa, at a charity party in London in September 2009.
After annoucing their engagement to the world, Kate poses with her Prince in December 2010 for their official engagement photos, taken by photographer Mario Testino.
Kate gets used to life in the public eye as she joins Wills on another public engagement - pancake tossing in Northern Ireland. Kate impresses with her pancake tossing skills.
Just days before the Royal Wedding, Kate is spotted picking up a few last minute bits on the high street.
The day before the big day, a relaxed-looking Kate is spotted heading into the Goring Hotel with sister Pippa.
With the whole world watching, Kate emerged from her car to reveal her gorgeous Sarah Burton for McQueen wedding dress.
Kate emerges from the church as the Duchess of Cambridge and practices her regal wave in a carriage ride with Wills.
The kiss! Breaking tradition Kate kisses her Prince not once but twice!
After a private honeymoon in the Seychelles, Kate makes a small official appearance in her new role as she meets US president Barack Obama and his wife Michelle. Her high street dress from Reiss is a major hit!
Kate experiments with a new look at the Epsom Down races wearing a floating white dress from Reiss and a white blazer from Joseph. She teamed the outfit with an elegant gold hat and a small clutch bag from L.K Bennett.
Kate dazzles in a shimmering, floor-length dress by Jenny Packham at the ARK gala at Kensington Palace, her first official public engagement since the Royal Wedding.
Newlyweds William and Catherine attend the 10th annual Absolute Return for Kids charity gala. Prince William made a speech at the do, announcing that his wife has joined his and Prince Harry's charity foundation.
Kate attends her first Trooping the Colour ceremony as a Royal in June 2011 sitting next to the Duchess of Cornwall. She looked lovely in a white suit and black hat.
Later that day Kate attended a friend's wedding with her sister Pippa, and wore the same hat she wore that morning!
The Duchess of Cambridge shows off a new hat by designer Philip Treacy at the service for the Order of the Garter at St. George's Chapel in Windsor.
...it looks like Prince William wants in on the hat competition as he outdid Kate with the headpiece he wore to take part in the Garter Knights parade.
Kate is a hit at her first military ceremony as a member of the Royal family. She confidently chatted with servicemen and children while William prepared for his speech.
Kate shows her maternal side as she chats to a young girl at the Irish Guards ceremony while William watches on.
Tennis fan Kate managed to squeeze in a spot of tennis before her and William's tour of Canada began. The pair watched Murray from the Royal box at Wimbledon.
Kate meets an aborable young fan whilst on her tour around Canada with new husband William.
The second Royal wedding of the year must have been much more relaxing for Kate. Here she is looking lovely in a cream coat and hat at the wedding of Zara Phillips and Mike Tyndall.
On her second royal engagement, Kate, along with William, officially opened a new children's unit at The Royal Marsden Hospital. The choice of hospital was fitting for the royal couple as during her years of charity work, Princess Diana visited the hospital on a number of occasions.
Kate and William were surprise guests at the Prince's Trust Concert at the Royal Albert Hall, hosted by Gary Barlow. A lover of the high street, Kate wore a Zara dress which soon sold out nationwide.
Dazzling in black velvet, Kate wowed at The Sun's Military Awards, where she also presented an award with William.
On a visit with her husband to the charity Centrepoint, Kate watches William throw some shapes!
Snap! Kate and Harry turn up to watch William play in a football match in matching wellies.
Kate attends the War Horse premiere in London's Leicester Square in January 2012 with William by her side. He even held an umbrella over her head so the rain wouldn't ruin her hair!
Kate looked stunning in a long, lace Temperley dress at the War Horse premiere, held the day before her 30th. Happy birthday Kate!
Kate makes her first official public appearance without William as she attends the opening of The Lucien Freud Portraits exhibition at the National Portrait Gallery - for which she is a patron.
Spending her first Valentine's Day as a married woman apart from William, Kate keeps herself busy by visiting alcohol-free bar The Brink in Liverpool. Kate is a patron of Action on Addiction which is behind the project.
Kate's got an admirer! Schoolboy Jaqson Johnstone-Lynch joined the crowds in Liverpool to give Kate flowers and a romantic cupcake as a Valentine's present. Check out our 135 easy cupcake recipes
As patron of charity The Art Room, Kate visited Rose Hill Primary School in Oxford to learn how children use art to help with behaviour issues. The Duchess looked stunning in a brown dove-print Orla Kiely dress with brown tights and boots.
Kate Middleton, Camilla and The Queen had a girly day out when they made an official visit to Fortnum and Masons in London.
Kate, dressed in a light blue coat with a daffodil pin to acknowledge St David's Day, looked happy to be out with her new family.
Kate teamed up with father-in-law Prince Charles to attend an event in support of The Prince's Foundation for Children and The Arts at the Dulwich Picture Gallery in London.
Kate wore traditional green for a St Patrick's Day parade in Aldershot, Hants. The Duchess's knee-length belted coat dress is by designer Emilia Wickstead and she teamed it with a pair of black heels and a stylish brown felt hat.
At the event Kate presented shamrocks to the 1st Battalion Irish Guards and also gave the regiment's mascot, Conmeal the Irish Wolfhound, a shamrock for his collar.
Kate Middleton and Prince William have been immortalised as waxworks by Madame Tussauds. The waxwork pair were moulded on the happy couple as they announced their engagement - we think they look pretty good!
As their first wedding anniversary approaches, William and Kate attend the premiere of film African Cats. We love how gentlemanly Wills holds the umbrella for Kate - she definitely can't get that super-stylish Matthew Williamson dress wet!
It's no rest for Kate and Wills after their night out at the cinema. As patrons of The Royal British Legion the couple attended a reception to celebrate the Scott-Amundsen Centenary Race to the South Pole. We love Kate's sensible tweed ensemble!
To support William as he made a speech at a dinner hosted by The Thirty Club, Kate opted for a sleek white gown by Roland Mouret. A daring side split and eye-catching sparkling Jimmy Choos - we're loving this more risqué side of Kate!
Kate wowed in a teal Jenny Peckham gown at the Our Great Team Rises Olympics event and pulled out all the stops for her red carpet appearance. She teamed the dress with a pair of Jimmy Choo heels and wore her hair in an elegant updo.
Check out the back of Kate's dress! The usually reserved Kate flashed a bit of flesh with the intricate lace design of her Jenny Packham gown.
Kate showed off some spring style while watching hubby William play polo at Cowarth Park for the Audi Polo Challenge. The Duchess wore a vintage-style shirt dress by Libelula with a pair of nude wedges - the perfect polo-chic look.
Aww, isn't this a lovely picture? Kate joined hubby William at the Sovereign Monarchs Jubilee lunch at Windsor Castle where she met dignitaries from Norway, Belgium, Kuwait and many other countries. We're loving the simple elegance of her pink knee-length dress.
Kate makes up for spending £1,200 on a dress by wearing it twice. After wearing the pink Emilia Wickstead at a royal engagement just a week before, Kate wore it again at a garden party to celebrate the Queen's Jubilee - at least she's getting her money's worth!
A big day for Kate! The Duchess was asked to join her husband on the Royal barge during the Thames Diamond Jubilee Pageant. Kate dressed in a striking red gown for the occasion and was seen waving to the crowds alongside the Queen.
Looking classy in a pale Alexander McQueen outfit, Kate Middleton stuck by Prince William's side as they attended a lunch at Westminster Hall as part of the Queen's Diamond Jubilee celebrations.
Kate can't stop smiling at the Trooping the Colour as she rides in a carriage on her way to Buckingham Palace with the other royals. Must bring back memories of her wedding day! Kate looked stunning in her grey Erdem dress and Jane Corbett hat.
Is Kate getting broody? The Duchess played with her dog Lupo and baby Savannah Phillips at the Beaufort Polo Club, while husband Will played polo with brother Harry.
Kate goes camping! The Duchess joined the Expanding Horizons Primary school camp at Margaret McMillan House in Kent. Kate even helped make a fire and set up a tent!
Kate enjoyed a good chin-wag with Sophie, Countess of Wessex and Camilla, Duchess of Cornwall at the service for the Order of the Garter in Windsor in June. Kate looked stunning in her white suit dress and stylish hat.
Kate and Will surprised the crowds at Wimbledon by turning up to watch Andy Murray play. We love the tennis-themed attire Kate, but haven't we seen that outfit before?
Once again Kate steels the show with her dainty hat and primrose yellow dress combo. Joined by the royal family Kate celebrated the fourth day of the Queen's Diamond Jubilee in Scotland at the Thistle Ceremony in St Giles Cathedral, Edinburgh.
Kate looked very excited as she and hubby William were given a rare, up-close look at the Olympic torch as it made its way through London past Buckingham Palace. She's so lucky!
Kate looked sophisticated in a sliver frock and elegant chignon hairstyle at a cocktail reception at the Royal Academy of Arts in London. Getting comfortable in her role, the Duchess attended the event without hubby William and was greeted by Prime Minister David Cameron.
Kate looks like she's having fun joining in on the Mexican wave fun at the Olympics with Wills. The pair were watching the tennis and cheering on Andy Murray.
Kate cheered on Team GB's swimmers at the Olympics in a red blazer and skinny jeans. She looked delighted at watching the event - while William looked a little nervous! Uunfortunately Kate's outfit didn't get a gold for Rebecca Adlington, but she still picked up a bronze medal.
Kate and Pippa both looked stunning at the wedding of their friends, Thierry Kelaart and Patrick Heathcoat-Amory at St Bartholomew's Church in Oxfordshire. We just love Kate's elegant blue dress and Pippa's beige ensemble.
The Royal couple attended the Football Association's £105 million St George's Park site near Birmingham to officially open the new national football centre. We think Kate looks very smart in her knee-length jacket and clutch bag - very nice.
Where to next?
After announcing she was expecting her first baby, Kate Middleton spent a couple of days in the King Edward VII Hospital suffering with acute morning sickness. Emerging fresh-faced after her stay, Kate accepted flowers from well-wishers.
Kate now has an official portrait of her hanging in the National Portrait Gallery. Kate was involved in the selection process for who would paint her first portrait, from which artist Paul Emsley, who won the gallery's 2007 BP Portrait Award, was eventually chosen to paint her. What do you think of it?
We love this photo of Kate and Wills at The Cheltenham Festival in Gloustershire. They were both grinning as they watched the horse racing, and judging by the expression on their faces, their horse came in!
Pregnant Kate looked absolutely stunning when she christened a new luxury cruise liner in Southampton. This was the Duchess's last official solo engagement before her maternity leave. The ship was suitable named, the Royal Princess.
After what seemed like the longest 9 months ever, we finally got our first glimpse of the adorable royal baby.
Kate gave birth to a boy at 4:24pm on the 22 July 2013, and the whole world celebrated the birth of the couple's first child.
And don't they look happy? Kate and Wills looked so proud of their new little family member.
Kate dazzled in a floor length Jenny Packham dress, at a gala dinner for the Tusk Foundation on the 12th of September 2013.
The Duchess's hair was restored to former glory and fell in glossy waves around her shoulders, and doesn't Wills look dapper?!
It's just a month and a half since Prince George made his way into the world, but you wouldn't know it from looking at the glowing couple, who are showing no signs of sleepless nights and countless nappy changes.
Kate was looking fabulous at her first solo public appearance since the birth of Prince George.
We don't know about you but we'd do anything for a flat tummy like hers - especially less than 3 months after giving birth!
Now, all we need is her and Wills to bring George out for us to see again - we can't wait for our next glimpse of the gorgeous little one!
Kate once again looked stunning when she attended her first royal appointment this year.
She wore a beautiful navy blue floor-length dress by designer Jenny Packham to the VIP event at the National Portrait Gallery and accessorised the outfit with one of the Queen's necklaces.
The Cartier necklace was given to the Queen to mark her marriage to Prince Phillip in 1947 and has been worn by Elizabeth throughout her life.
Kate has stepped out for her first solo appearance since the royal couple's tour of Australia and New Zealand to launch Britain's bid for glory in the America's Cup (a two-yacht race that Britain hopes to win for the first time by 2017), at the Royal Maritime Museum in Greenwich.
Wearing a beautiful cream and navy shift dress, that's now in the sale for £99 from one of Kate's favourite high street stores Jaeger, the Duchess looked radiant during her visit after arriving to find a cheering crowd waving Union flags waiting for her.
Ahhh doesn't Kate Middleton look lovely on her visit to the Blessed Sacrament School in north London yesterday.
The Duchess of Cambridge arrived in Islington to see the impact of the M-PACT Plus project that she and comedian John Bishop launched in Manchester last year to help families affected by addition.
It helps to provide support for schoolchildren affected by the misuse of drug or alcohol in their family.
The stunning red dress is made by Goat and sadly it's out of our budget, with a price tag of £308. We're loving the new half-up do' though Kate!
We love this picture of Kate and William sharing a funny moment while watching the swimming at the Commonwealth Games in Glasgow on 28 July.
William gave Kate's lanyard a tug and Kate looked like it caught her rather off-guard!
Oh and kudos to the lady sitting in front, who unknowingly seems to have photobombed this now-famous picture!
Kate and William commemorate the 100th anniversary of World War One by attending a memorial ceremony at the Saint-Laurent Abbey in Belgium.
Kate Middleton and Prince William made a royal appearance at Wimbledon on 8 July 2015, and we're sure the parents, who had just welcomed their second child two months before, enjoyed a day off from their parental duties to watch a spot of tennis.
Kate and Wills are regulars at Wimbledon, with both of them being big sporting fans in general.
The Duchess, who was last pictured just days before this at Princess Charlotte's christening service, was looking incredible in a scarlett red dress from LK Bennet. Can you believe she only gave birth two months before this?
According to a source, the Duchess hired a 'discreet' personal trainer during her pregnancy to get her back to her pre-baby fitness. Although we reckon those Middleton women have got pretty good genes when it comes to their slender physiques!
Even duchesses have to go out in the rain, you know! Handy then, that they have one of those faithful servants to follow them around with an umbrella, why don't we have one of those?
Kate's latest outing was a little drizzly, but the mum-of-two didn't let that dampen her spirits. Attending the America's Cup World Series in Portsmouth with her husband, Kate and Wills watched as Olympic sailor Ben Ainslie's take to the water was beaten back by the stormy weather. The couple looked relaxed and comfortable in their matching sporting tops, which had 'The Duke of Cambridge' and 'The Duchess of Cambridge' emblazoned on the back.
Little Freddie Wilson and his mum Wendy Maxwell chatted to Kate as she made her way down the lines of well-wishers. When Kate asked how old Freddie was he replied, 'I'm three.' Wendy told reporters that when she told Kate, 'He is only 2,' Kate replied, 'George says that. He thinks that he's older.'
Speaking to a sleepy little boy in the crowd, also named George, she asked him if he liked Peppa Pig, and added that she hoped Charlotte would be doing lots of sleeping like him, too!
Kate's made her first solo engagement since the birth of Princess Charlotte, and doesn't she look incredible?
The Duchess was keen to show off her brand new hairstyle - a soft fringe cut in around her face - and her hair was blow dried to perfection for the occasion. The mum of two was visiting the Anna Freud Centre to support the centre's work on promoting mental health in children - a cause close to her heart.
The Duchess looked stunning in a floaty houndstooth number, which she teamed with simple black court shoes.
It's Kate's first official appearance since she became a mother for the second time back in May. Kate Middleton has been keeping a low profile in the meantime, and it's thought that she's been at her and Prince William's country retreat Anmer Hall while adjusting to life as a mother-of-two.
Kate, you look fantastic!
Kate and Wills were pictured out and about at the Rugby World Cup opening ceremony in Twickenham this weekend, and the Duchess was all smiles in a vibrant bright blue coat from high street favourite Reiss.
The pair, who welcomed their second child Charlotte at the beginning of May, were spotted laughing and clapping as they supported Prince Harry, who gave a speech to the 82,000-strong crowd at the event.
'This evening marks the beginning of a celebration of rugby that I hope will inspire current players and new generation,' he said. 'There will be moments that will live with us for rest of our lives.'
'To all the players, we wish you well for the tournament. Your individual skill is to be celebrated and I can think of no other sport in which the success of the team is shouldered so equally by everyone.'The appearance was one of Kate's first appearances since her maternity leave ended. Doesn't being a mum-of-two suit her?
Click through to see how Kate has changed over the years...
We love this comparison picture which shows the Duke and Duchess of Cambridge both on and off-duty all in one day.
The royal couple spent their morning on an official visit to Harrow College in London where they met young people who are overcoming mental health problems and now volunteering in an anti-stigma campaign to help others in similar situations.
Kate and William have both long been supporters of charities that help young people with mental health problems such as depression.
Later in the day however, they were able to indulge in a spot of sport when they attended the Australia v Wales Rugby World Cup match at Twickenham Stadium, where Kate was seen really getting into the spirit of the game!
Kate, seen here raising a toast with guest of honour Chinese President Xi Jinping, looked ravishing in red at her first state banquet in October 2015.
The Duchess attended the white-tie occasion, which was hosted by the Queen and Prince Phillip at Buckingham Palace, in a full length, scarlet Jenny Packham gown with capped sleeves.
She accessorised with drop diamond earrings, a diamond bracelet, and the intricate 'Papyrus' tiara, also known as the Lotus Flower; an item of jewellery once owned by the Queen Mother. This was only Kate's third time wearing a diamond tiara - the first was at her wedding in 2011, where she wore the Cartier 'Halo' design, and the second was at a reception for diplomats in 2013.
Kate and William were both seated at the top table at the event, but notably not together - she was seated in the most prominent position for a female member of the royal family after the Queen, and looked every inch her important part!
Just hours after attending her first state banquet, Kate looked elegant and fresh-faced as she greeted Chinese president Xi Jinping and his wife on the second day of their state visit to Britain.
Wearing a plum lace dress by Dolce and Gabanna, the 33 year old waited with her husband on the steps of Imperial College London to attend a cultural event at the university with the president and his wife.
In a change from the previous evening's updo, she wore her hair in long curls, styled with her new statement fringe, which she had cut in in September. William, meanwhile, co-ordinated with her dress with a matching purple tie.
The couple have been entertaining president Jinping and his family during their visit, which experts hope will secure £30 billion of trade deals, including huge investments in infrastructure projects. No pressure, then, Kate!
With two small children in the house we should have guessed that Kate would be a big fan of Shaun The Sheep!
The Duchess attended the BAFTA film premiere with her husband and her brother-in-law, Prince Harry, on Monday morning.
Whilst they were at the BAFTA event, they also took part in a traditional British farming game of 'welly-wanging' but sadly for Kate her shot fell well short of the target! Luckily, sportsman Harry made up for her performance.
As always Kate was a huge hit with the children at the event.
We are beginning to wonder if Kate will get a moment to put her feet up?
With two children at home and an increasingly busy social schedule, Kate has continued her hectic week of royal engagements, which included a state banquet with the Chinese president, a trip to Dundee and the Shaun The Sheep premiere, with a visit to Islington Town Hall.
There she met with the charity Chance UK who work with children aged 5-11 that are at risk of developing anti-social behaviour or moving into a life of crime. By providing the youngsters with a weekly mentoring session with an adult volunteer, Chance UK hopes to turn their prospects around.
After a late night at the James Bond Spectre premiere, Kate and Wills were back on thier charity circuit to meet children and parents involved in the program.
The Duchess was wearing a dress from designer Orla Kiely.
Kate's visit to Action on Addiction came after a morning spent on the trading floor at the ICAP charity fundraiser.
Whilst William was keen to get his wife to stop embarrassing him by 'flirting' with other brokers it seems Kate's persusasive techniques paid off when she closed a lucrative deal.
Kensington Palace shared the moment Kate as so overcome with joy that she decided to break into dance with the other traders...oh Kate, will you be our best friend?
We're so used to seeing the Duchess with her iconic long hair, but Kate's gone for the chop! She chose today's visit to London for ICAP's charity day to debut the brand new 'do.
The glamorous princess has updated her look by opting for a shorter, wavy long bob, or a 'lob' as the style has become known. Kate, whose long brunette locks have become a sought-after style for women everywhere, wore her new short look parted to the side with a flattering fringe.
We know Kate's a fan of recycling her favourite outfits and this time she paired her new hairstyle with a L.K.Bennett teal dress, which she last wore in 2012 during the Queen's Jubilee tour.
Manning the phones, where all of today's revenue from the brokerage firm will go to charity, we think Kate looks the City worker part!
The Duchess of Cambridge made a trip to Wiltshire on Wednesday to meet with the charity Action on Addiction, of which she is a patron.
The Duchess of Cambridge wore a teal dress by British designer Emilia Wickstead, worth over £1000, which she previously wore in April of this year.
She also wore a more affordable option, a £300 coat from high street retailer Reiss.
During the engagement, Kate met with both addicts and their support workers and she spoke about how 'powerful' it must be for those touched by addiction.
The Action on Addiction program was celebrating a graduation ceremony for students with addiction counselling degrees at the University of Bath, which Kate attended.
Speaking to Anna Elston, 43, a former alcoholic, who had managed to get her children back after her recovery, Kate said; 'I'm so happy and pleased that you got your children back.'
The Duchess attended the Christmas celebrations in a very festive red Alexander McQueen dress that she's previously worn twice before.
Kate first visited the Anna Freud Centre back in September, which was her first official royal function after giving birth to daughter Princess Charlotte.
After receiving several invites for charity Christmas festivities, Kate decided to return to the charity, reflecting her commitment to child mental health issues.
The centre runs a Family School, which provides mental health support for children with serious emotional and behavioural issues.
It's officially Christmas for the Duchess of Cambridge!
Kate spread festive cheer at the Anna Freud Centre, a leading institution for youngsters with mental health issues, when she attended their end-of-term celebrations in North London.
George and Charlotte's mum seemed to be having a lot of fun while helping the children make Christmas tree collages. She was also treated to a musical performance, given by the children to showcase the drumming skills they've been learning over the term.
Kate didn't just watch though - in a video shared by Kensington Palace on Twitter, the mother-of-two can be seen joining in the performance, drumming to the beat of 'We will rock you'.
Kate Middleton has admitted to friends that she isn't as in love with her new haircut as everyone else.
The Duchess of Cambridge has revealed to close friends that her new 'do has left her feeling 'mumsy'.
The mother-of-two went for the chop at the beginning of December, taking off a couple of inches and having a side fringe added, which she reportedly calls her 'mum fringe'.
Royal hairdresser Richard Ward was responsible for Kate's new look but said she was 'a bit unsure about it'.
Following the cut, many have pointed out Kate's resemblance to her mother Carole Middleton.
It was also reported that her majesty herself might have played a role in deciding upon Kate's new image, going against her previous 'glamorous' long locks which were often styled in curls to have a more 'sensible' style.
Either way, Kate we love it!
Kensington Palace was turned into a newsroom, and from there Kate helped coordinate the publication of articles, blogs and videos she'd commissioned, all about the need to address mental health issues in children and young people.
She also met a few of the children featured in the campaign video, a report about children's mental health issues. Besides commissioning material from experts, journalists and touching personal stories, she also wrote a poignant blog post herself. Introducing the campaign, the mum-of-two talked about how she would not hesitate to seek help for George and Charlotte if they experienced mental health issues, and how she encourages them to talk about their feelings.
Kate has stepped into her very stylish editor shoes, and all for a good cause.
The Duchess of Cambridge became a journalist for the day for the Huffington Post UK, in a bid to raise awareness to the importance of mental health in children and young people.
Dressed in a casual but very elegant ensemble, the 34-year-old mum of two paired a cream blouse from high street retailer Reiss with a black-and-white wrap skirt from Italian designers Dolce and Gabbana. Her 'mum hair' looked flawless, as always, and she kept it simple in the accessories department, so it's clear the Duchess knows what makes a perfect outfit for a day at the office.
Kate looked gorgeous in green as she arrived at St Catherine's primary school in Edinburgh to talk with headteachers about the impact of children's mental health charity, Place2Be, of which she is a patron.
The Duchess smiled and waved as she was greeted by the children of the school, two of whom presented her with a posy of flowers.
During her trip to Scotland Kate will visit various charities, and also attend a tennis workshop with Andy Murray's mother Judy alongside a group of children, teachers and volunteers.
Seeing as she and husband Wills are regulars at Wimbledon, we reckon the mum-of-two will have a great serve!
The Duke and Duchess of Cambridge spent the afternoon visiting the XLP Mentoring Project at London Wall.
For their second public engagement in the capital today, Kate wore a bespoke dress created by Eponine, a Kensington-based designer brand, which reportedly costs £600.
The XLP charity works in more than 75 schools across the city to help 11-18 year olds who are facing emotional and behavioural challenges that affect their school work and are at risk of more antisocial trouble.
The young people are assigned a mentor from the program who oversees their work and progress on a 12-week schedule.
Last year, when Kate was eight months pregnant with Princess Charlotte, the pair visited another XLP project in South London, Gipsy Hill.
It follows a day of meetings yesterday where the mother-of-two raised awareness surrounding mental health problems and particularly suicide.
In honour of the Queen's 90th birthday, the royals attended a Commonwealth Day Service at Westminster Abbey on Monday afternoon and Kate couldn't help but talk about her little ones.
Kate, 34, revealed that her daughter Charlotte is 'getting bigger by the day', while it turns out George is just like other two year olds and can't get enough of his scooter (and apparently he's a bit of a dare devil)!
'He's got a scooter. He's going super fast on it,' Kate told a group of school children outside Westminster Abbey as she rolled her eyes in only a way a mother can, before admitting, 'It's hard to keep up with him!'
And if there was any doubt as to whether George is going through the same experiences as all big brothers Kate confirmed, 'Charlotte is keeping him in check'.
The ceremony was held in celebration of the Commonwealth, the 53 nations of which Queen Elizabeth is Head of State.
Flanked by the Duke of Cambridge and her brother-in-law Harry, Kate looked stylish in an Erdem coat, reportedly costing £2,500, and a large hat by John Boyd - a hatmaker in Knightsbridge.
Despite being the centre of Kate's conversation to the school children, Prince George and Princess Charlotte were not present at their great-grandmother's ceremony. Perhaps the parents are enjoying a welcome break after the hectic skiing holiday with their two toddlers?
Regardless, the young couple will have enjoyed the service as singer Ellie Goulding took to the stage - a favourite of the pair who also performed at their wedding in April 2011.
It's been a very busy month so far for Kate, who's been out and about with the rest of the royal family to celebrate the Queen's 90th birthday.
One special outing they all made was to the annual Garter Day service at Windsor Castle, where the royals happily greeted crowds in the damp weather.
Kate looked radiant in red, an outfit which she's actually worn before! The Duchess' Catherine Walker coat is the same one she wore in 2011 during a visit to the Calgary Zoo, in Canada.
And did you spot the very special items she recycled from her wedding day? Her Robinson Pelham teardrop diamond earrings, a wedding gift from her mother and father Carole and Michael Middleton, were the same ones she wore to marry Prince William in 2011.