Nadine Coyle is pregnant with her first child.

The Girls Aloud singer announced she is expecting a baby on her Instagram account yesterday (14.08.13), but she has yet to confirm the father's identity.

The 28-year-old beauty posted a picture of herself smiling on the social networking website and emblazoned the image with the text, ''I am having a baby. Xx (sic)''

Nadine - who shot to fame in 2002 as a member of the chart-topping 'Call the Shots' girl band - was immediately inundated with an outpouring of happy responses from her fans, and also received a message of congratulations from former bandmate Cheryl Cole.

The 30-year-old pop star wrote on Twitter: ''I just woke up to the news that there is to be a baby aloud!! This is so crazy. But amazing!!

''Congratulations @nadinecoylenow. Can't believe you're going to be a mummy!!!!!!!!!!! ❤❤❤ (sic)''

It's not yet known who she is expecting her little bundle of joy with, but it's thought Nadine recently reconciled with her ex-fiancé, former NFL player Jason Bell.

The couple called off their one-year engagement in June 2011 but have reportedly rekindled their romance in recent months, and Jason was even spotted jetting into London to see Nadine perform with Girls Aloud at The O2 arena earlier this year.