Nadine, who became a first-time mum earlier this month, sent her well-wishes in a message posted to Twitter last night after 32-year-old Kimberley announced that she is expecting her first child with long-time boyfriend Justin Scott.
Nadine tweeted: "Congratulations Miss Kimberley. I hope you love every second as much as I did. Xx."
Meanwhile Nadine, who announced the birth of her baby daughter on 10 February with boyfriend Jason Bell, also updated fans on motherhood, explaining that she is in "total baby bliss".
"I have so many of you to thank for your gifts & well wishes," she said. "I am in the land of total baby bliss. Thank you all for your love & support. Xx."
Congratulations Miss Kimberley. I hope you love every second as much as I did. Xx— Nadine Coyle (@NadineCoyleNow) February 25, 2014
Doting mum Nadine, who has yet to reveal her daughter's name, didn't spend too long on the social networking site, telling fans: "I have to get back to staring at my little pink bundle (my life since she was born) Loads of love to you!"
Kimberley will now be the second Girls Aloud star to become a parent and we wonder if Nadine will be giving her some tips?!
After Kimberley shared her happy baby news, she was inundated with messages on Twitter from her showbiz friends.
Bandmates Cheryl Cole and Nicola Roberts couldn't contain their excitement, and Cheryl later shared a picture of herself hugging best friend Kimberley, saying: "Emotional hugs for an emotional day…"
Stars send congratulations to pregnant Kimberley Walsh - pictures: