The TV presenter took to Twitter.com on Wednesday (10Oct12) to announce the baby news, revealing she is due ""around May time"".
The baby will be a little brother or sister for the Rooneys' son Kai, who turns three next month (Nov12).
In her tweet to fans and followers, Coleen Rooney wrote, ""A few people guessed, so news is out ha!! Me, Wayne and Kai are thrilled that we are expecting a new addition to our family.""
She added, ""It's still only early but bursting with excitement! Also wanted the news to come from us, before anyone else!""
The announcement was retweeted by soccer star Rooney.