The former Girls Aloud star welcomed her first child with boyfriend Justin Scott on Thursday, 4 September and yesterday she marked seven days since that special moment.
Kimberley tweeted: "Can't believe my little man Bobby Jay Scott is already a week old."
Her tweet also revealed for the first time that Bobby's middle name is 'Jay'. So far she hasn't revealed if her son's names have any special meaning to the family.
Kimberley announced her son's birth on 5 September and was sent congratulatory messages from fans and famous friends, including her Girls Aloud bandmates.
Best pal Cheryl Fernandez-Versini was quick to tweet that she'd seen the baby and he was "perfect", while Nadine Coyle – a mum herself – said: "Congratulations on your baby boy! The next few weeks & months are baby boot camp! Have fun and be well! Good luck!"
Copyright: WENN Lexi Jones
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