Girls Aloud star Nadine announced she was pregnant with her first child in August, however she didn't actually say who the dad was!
Nadine split with her fiancé Jason, a former American football player, in 2011, and she has now admitted she forgot to make it known to fans that they were back together again.
In an interview, Nadine says: "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!'"
Irish Nadine, who now lives in Los Angeles, announced her baby news by posting a picture of herself on Twitter, saying: "I'm having a baby!"
She began dating Jason in 2008 and during their relationship, they got engaged to each other. The couple split in May 2011, however, Nadine insisted that they were still "great friends".
Nadine told her Twitter followers: "A few weeks ago Jason and I broke up. We are great friends and decided we are better this way."
The singer, 28, reformed with her Girls Aloud bandmates - Cheryl Cole, Nicola Roberts, Kimberley Walsh and Sarah Harding - for their 10th anniversary last year.
The group toured the UK earlier this year and Jason was spotted jetting in to support Nadine, sparking speculation that they were back together.
Last month, Nadine cradled her baby bump as she arrived in London - alongside Jason.
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