Kate Middleton's nickname for Prince Louis revealed in rare public moment and we can't cope with the cuteness

Kate Middleton has the sweetest nickname for little Prince Louis!

Kate Middleton and Prince Louis around campfire with Louis eating marshmallows - Kate Middleton's nickname for Prince Louis
(Image credit: Getty)

Kate Middleton's nickname for Prince Louis was revealed during his first official engagement and it's just too cute!

Kate Middleton has let slip her unusual nickname for Prince Louis and its utterly adorable.

The Princess of Wales joined her husband Prince William and their three children, Prince George, nine, Princess Charlotte, eight, and Prince Louis, five, for their first royal engagement with Prince Louis in tow. 

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The Wales family volunteered with the 3rd Upton Scouts Group in Slough as part of the Big Help One initiative which was set aside in tribute to King Charles' coronation

During the special day, they helped paint, shovel and also enjoyed eating s'mores toasted on the camp fire.

As Prince Louis began to toast marshmallows by the fire pit, Kate could be heard using the unusual nickname she has in a video shared by journalist Rebecca English, telling her youngest son, "Pop that in the fire, Lou Bug."

Kate Middleton's nickname for Prince Louis - Princess Charlotte, Prince George, Prince Louis and Kate Middleton around the campfire

(Image credit: Getty)

Fans were thrilled to see the family getting stuck in together for the rare appearance, with one writing, "These pictures are so heartwarming."

Another added, "Although Prince Louis was absent from the concert last night because it was too late for him, it was great to see him today on his first royal engagement."

One more royal fan added, "I love so much that the children are out and about learning the work of their parents."

Prince George and Princess Charlotte have a cute nickname for Prince Louis, which is Lou Lou.

Kate previously revealed that Prince George had a nickname for dad Prince William and it looks like they all go by a different name to the one they use formally.

Selina Maycock
Senior Entertainment Writer

Selina is a Senior Entertainment Writer for Goodto.com, Woman&Home, and My Imperfect Life with more than 16 years of experience in newspapers and magazines. She currently writes a mix of Entertainment news - including baby news, weddings, reporting the the latest news about the Royal kids Prince George, Charlotte, Louis, Archie and Lilibet as well as Family news stories. Before joining Future Publishing, Selina graduated from the University of Sheffield in 2006 with a degree in Journalism. She is fully NCTJ and NCE qualified and has 100wpm shorthand. When she's not interviewing celebrities you can find her exploring new countryside walking routes, catching up with friends over good food, or making memories.