The 30-year-old singer - who was accompanied to Thursday's ceremony (21.05.09) by her musician husband Richard Jones - boasted flawless skin and smoky eyeshadow on the red carpet, making her admission all the more surprising.
Richard let slip his wife's secret, telling BANG Showbiz: "I'll let you in on a little secret. Sophie's got last night's make-up on!"
To which Sophie quickly replied: "Well I didn't have time to change, but it works, doesn't it?"
The singer attended the prestigious awards - which were held at London's Grosvenor House - wearing a simple black dress and heels.
On Wednesday (20.05.09), Sophie performed her new single 'Heartbreak (Make Me A Dancer)' on UKTV show 'The National Lottery Draws'.
She later attended Island Records' 50th birthday party in London, where she sported smoky purple eyes complete with black eye liner and peach blUsher.