Justin and his dad Jeremy Bieber introduced the latest addition to the Bieber clan to the world with adorable Instagram photos.

Though Justin and his other half-siblings, Jaxon, 8, and Jazmyn, 10, have 'J' names, their dad decided to leave the tradition behind with an unusual baby name for his new baby girl - Bay Bieber.

Jeremy posted a sweet picture to Instagram yesterday announcing the birth of his daughter, telling his 2.3 million followers: ‘We welcomed a healthy baby “Bay Bieber” born at 830am.’

Standing alongside his wife Chelsea and the new baby, Jeremy can barely contain his excitement behind his white hospital mask – cute!

A photo posted by on

Jeremy married Chelsey in February, when she was already pregnant with Bay.

Hot on the heels of his dad, Justin also posted a cute pic of baby Bay just hours later, in which the youngest Bieber is already giving the camera her best smile.

Welcoming his new baby sister, Justin wrote: ‘Meet the newest Bieber, my little sister BAY BIEBER’

A photo posted by on

In less than 24 hours the image has wracked up over 6 million likes, and fans were quick to congratulate the Bieber family on their latest addition.

One person commented: ‘@justinbieber you will make a awesome brother.’

Another said: ‘This is such a cute picture! Happy birthday Bay!!’

Hinting at Justin and model Hailey Baldwin’s recent engagement, a third follower gushed: ‘Aww so cute Justin congratulations on that beautiful little sister. I can’t wait to see you and Haileys baby??? Super excited for you. I am so glad you are so happy. I love you Justin forever and ever.’

Justin popped the question to his girlfriend Hailey little over a month ago, but plenty of fans were quick to jump to the conclusion that Bay was their daughter!

‘His own daughter?’ one Instagram user asked, while another added: ‘Legit thought she was your kid before I read the caption.’

It’s not quite the baby news Justin’s fans were hoping for, but we couldn’t be happier for Bieber family. Welcome to the world Bay!

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