Nadine Coyle has revealed that she is pregnant with her first child.

The ex-Girls Aloud star, 28, posted a snap of herself on her Instagram account, underneath the words "I'm having a baby".

Northern Irish singer Nadine will be the first of her former Girls Aloud bandmates to become a mum.

The band - Nadine, Cheryl Cole, Kimberley Walsh, Sarah Harding and Nicola Roberts - recently reunited for a 10-year celebration tour but split after their final concert in March.

Nadine suggested she wanted to continue with the girl group, tweeting: "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 singer released her last solo album, Insatiable, in 2010, but it only peaked at number 47 in the UK charts.

She revealed earlier this year that she was working on new solo music.

Nadine split from her American footballer fiance Jason Bell in 2011, but he was pictured watching the group perform in London earlier this year.

Former bandmate Cheryl tweeted her congratulations, writing: "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!!!!!!!!!!!"

Ex-Girls Aloud star Nicola tweeted: "Congratulations on your lovely news x."