Justin Bieber welcomes new baby sister

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!

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’

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!