Cheryl, who has made no secret that she wants children, tweeted: '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!!!!!!!!!!!'
Nicola Roberts also tweeted: '@NadineCoyleNow Congratulations on your lovely news x.'
Kimberley soon joined in on the well wishes, writing 'Congrats on your exciting news!'
Other celebrities to send their wishes included Alan Carr, who wrote:
'@NadineCoyleNow Congratulations!! Woo hoo!! Al xxx'
Former Westlife member Brian McFadden tweeted:
'Congrats to @NadineCoyleNow on the baby news. fantastic news xxx.'
Nadine is the first former Girls Aloud member to become pregnant, and Cheryl has already dubbed the first child as ‘Baby Aloud’.
Nadine is yet to confirm the father of the child but it is likely to be on-off boyfriend Jason Bell.
She split from the ex-American footballer in 2011 but they have been photographed together in recent months.
Fans also showed their support for the Irish singer. One tweeted:
"A massive congrats to on of my idols @NadineCoyleNow who is expecting a baby :-)" (sic)
Another said:
"Omg I can't believe @NadineCoyleNow is having a baby! I'm so excited and happy for her! She is going to be an amazing mum!"
We wonder whether Girls Aloud will have an army of babies to rival The Saturdays’? We hope so!