Published Wednesday, 01 January 2014
Nadine Coyle, who is pregnant with her first child, is expecting a girl (© Presseye)
The 28-year-old posted a photo of a baby shower balloon on her account, with the caption: "It's a girl."
Last August she had already used Instagram to announce she was expecting her first child.
The Derry-born singer later opened up about her surprise pregnancy in a Hello! interview, naming her on/off lover former American football star Jason Bell as the dad.
On New Year's Eve, she tweeted: "2013 has been the best year so far! Thank you all for your contribution. Sending loads of love, wishing you all the best for 2014! Xx"
It comes after she tweeted in December that she had a 3D scan recently.
"My baby is all lips and chubby cheeks! I could bust they are so cute!"
The singer and Bell started dating in 2008 and announced their engagement in September 2010 before splitting in June 2011.
She discovered she was expecting this summer but first chose to keep the father's identity a secret.
She told Hello!: "I think we just forgot to tell everyone we were together... When I said I was pregnant I thought, 'Why's everyone wondering who it is?' Then I remembered, 'Oh yes, that's right. I do stuff on TV and people are confused'. So this clears it up!"
She admitted then she was still coming to terms with the prospect of becoming a mum, adding: "I think I was the least likely (member of Girls Aloud) to be the first to have a baby.
"A couple of the other girls had wanted babies for a long time but I said no way... It was definitely a shock, but I was really, really happy."
The band - with Cheryl Cole, Kimberley Walsh, Sarah Harding and Nicola Roberts - split after their final concert in March last year.
© UTV News