The former Girls Aloud singer announced she was expecting her first child with long-term partner Justin Scott earlier this year.
She shared it with the caption: 'Gives a whole new meaning to the term 'belly top'.'
She revealed the happy news on Twitter, writing: ‘Justin and I are so happy to let you all know we are having a baby!!! Couldn't wait to share our lovely news with you all.’
Kimberly’s best friend, fellow Girls Aloud member Cheryl Cole was one of the first to celebrate the happy news, tweeting: ‘Finally! I am able to share some of the BEST NEWS EVER!!! Kimberley and Justin are expecting their first baby together - it has been both one of the most exciting and yet hardest things to keep in!!’
Band mate Nicola Roberts also tweeted: ‘Secrets out!! I am BURSTING with love! Kimberley & Justin are having a baby! I am so happy and so literally beside myself with excitement!!!’
Kimberly revealed after her pregnancy announcement that she feared she had left it too late to have a large family after concentrating on her career throughout her twenties.
She told the Mail Online: ‘I would like a big family but I am realistic and I’m aware at 32 I have left it a little late… So I’m realistic about how many I can have, but I would like to have more than one.’