Lily Allen's Wardrobe Malfunction During Video Shoot

Yesterday she was unveiled as the face of one of Britain's most prestigious art galleries. But Lily Allen's elegant image didn't last too long.Today the singer was back to her usual ways with a cheeky wardrobe malfunction - albeit in a resplendent full-length gown.The outspoken songstress was left a little over-exposed in the backless, shimmering gown as she popped out of filming a video for her latest single, 22.

Lily was on a cigarette break and chatting to crew when she made a boob and her gown gaped open to reveal that she was not wearing a bra.Ironically, as the poster girl of the National Portrait Gallery, artist Nadav Kander urges the viewer to 'take another look' at people in the public eye.

It reveals that Lily was training to be a florist when her music career took off in 2006.But fans of The Smile singer will not be surprised by her latest antics.She is no stranger to showing off her body. The 24-year-old singer has been pictured topless on beaches from Jamaica to Thailand, France and the Carribean.

And earlier this year, she confessed to sending a topless text to Kaiser Chiefs' frontman Ricky Wilson.She also bared her 'third nipple' on Dutch TV.During the shoot, she sported a sleek, dark bob with a blunt fringe near Covent Garden, London. The video will feature more than 20 dancers.