The former Girls Aloud star, 28, has remained fairly quiet since announcing via an Instagram photo on 15 August that she's expecting her first child.
But in a Twitter session with fans on on Monday night (2 September), Los Angeles-based Nadine said: "Good catching up. I read all your messages. This baby making business is no joke. Have a great rest of your day! Xx."
Nadine is yet to reveal who the baby's father is, but she already told her Twitter followers that she's "excited" to embark on the journey into motherhood.
Tweeting last week (25 August), she said: "Thank you all for your messages about the baby. I am so excited. Told you all it has been wild. Here we go on another journey! Love you. Xx."
Nadine will be the first member of Girls Aloud – which includes Cheryl Cole, Nicola Roberts, Kimberley Walsh and Sarah Harding – to become a mum.
When she announced the news, her band mates took to Twitter to share their congratulations. Cheryl described the news as "crazy", before adding, "Can't believe you're going to be a mummy!"
Take a look at more pregnant celebrities below:
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