The 27-year-old star and her soccer player husband Wayne Rooney welcomed their second son into the world in the early hours of this morning (21.05.13) and the pair have named the new arrival - a brother for three-year-old Kai - Klay Anthony.
Tweeting shortly after giving birth, Coleen wrote: "At 2.11am our Beautiful Son .... Klay Anthony Rooney entered the world.
"He weighed 7Ib 11.1/2 oz We`re all so happy and doing well. X (sic)"
Coleen - who revealed over the weekend she had passed her due date - was rumoured to have been taken to hospital on Saturday (18.05.13), after admitting she had struggled to sleep the night before.
She tweeted: "Such an uncomfortable sleep last night!!! #hurryupbaby (sic)"
The couple announced in December they were expecting a son, two months after confirming Coleen`s second pregnancy.
Coleen has previously admitted she would love to have a large family, saying: "I`d like to have maybe three or four children. I`d be happy to be a full-time mum."
Manchester United ace Wayne, 27, and Coleen married in Italy in 2008 after a five year engagement.