The singer, 33, was so thrilled to be reunited with Bobby after a period of absence that she couldn't resist sharing a snap of him on Twitter...
And we're already in love with the little tot!
In the picture, Kim looks stunning in full make-up as she cuddles her three-month-old child, her first with Justin Scott.
Alongside the heartmelting photograph, Kim wrote: "So happy to be back home with my little munchkin. I actually missed the smell of baby sick."
She must be smitten!
Kim had been away from her son only briefly after returning to work...
On Friday (5 December), she appeared on This Morning helping viewers choose the best party frocks for the festive season.
So happy to be back home with my little munchkin I actually missed the smell of baby sick pic.twitter.com/Jeqm4O67Hn— Kimberley Walsh (@KimberleyJWalsh) December 5, 2014
Kimberley, who has kept a relatively low profile since becoming a mummy in September, recently announced she was engaged to long-term partner Justin.
The former Girls Aloud star told fans the good news on Twitter by posting a picture of her manicured hand, with a HUGE diamond sparkler on her ring finger!
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See the celebrity couples who have welcomed babies in 2014:
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