Taking to Instagram, Billie posted a photo of her baby boy sleeping as she told fans she couldn't believe it's been a week already since she gave birth.
In her black and white snap, the former TOWIE star's newborn can be seen snoozing while clutching onto the hands of his mum and dad.
Alongside her photo, Billi gushed: "Can't Believe My Baby Is 1 Week Old Already."
Seven days ago, Billi and her fiancé Andy Carroll welcomed their son Arlo, their first child together. Announcing his safe arrival on 15 June, Billi tweeted: "Welcome To The World Our Beautiful Baby Boy @AndyTCarroll."
A few days later, the yoga expert revealed she and footballing pro Andy have named their little boy Arlo - otherwise known as "Little A.C".
Since welcoming her bubba into the world, Billi has continued to share a slew of photos with fans. Over the weekend, she marked Andy's first Father's Day, spoiling him with a handful of pressies and a cute balloon from herself and their new addition.
Sharing a few snaps to Instagram, she said: "Billi wrote: "Happy Fathers Day Daddy We Love You So Much @andytcarroll#LoveMyLittleFamily."
Billi first announced she was expecting on Christmas Day last year. Her and Andy's baby joy came just two months after the couple revealed they are engaged.
Andy popped the question during a romantic break in Rome.
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