The expectant star, who has described her pregnancy as "a really great dream I don't want to wake up from", smiled widely as she was pictured at this year's Nordoff Robbins Boxing Dinner at The Lancaster London Hotel.
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For her first public event since sharing her baby news, she had dressed her bump discretely, covering up in a loose-fitting shirt and blazer which covered up her blossoming figure.
Completing the look was a pair of black leggings – which showed her legs were as toned as ever.
Nadine, 29, announced her pregnancy in August, but has so far not revealed the identity of the baby's father. She shared her happy news by posting a picture of herself on Instagram with the caption, "I'm having a baby" written across the image.
Although the Northern Irish singer has not commented, it is rumoured that the child's daddy is her on/off boyfriend and former fiancé Jason Bell, with who she reportedly reconciled earlier this year.
Nadine dated the retired American footballer, 35, for three years before their split in June 2011.