Pop star Nadine Coyle is expecting a baby. The former Girls Aloud singer, 28, shared the happy news with fans by posting a snap of herself on Instagram.com, alongside the caption, "I am having a baby". The singer will be the first member of the Biology hitmakers to become a mother. Coyle has not gone public with the name of the father, but she was last linked to U.S. businessman Waz Ashayer in 2012. The pregnancy news comes five months after Coyle told fans of her heartache over the decision to break up the band. She had fought for Girls Aloud to stay together following their split announcement at the end of the group's 10-year anniversary tour in March (13). In a tweet, she wrote, "You should know by now I had no part in any of this split business. I couldn't stop them. I had the best time & want to keep going." The claim was later shot down by bandmates Sarah Harding and Cheryl Cole, who insist the decision to break up the band was agreed by all members.