Guess Who: Rear View Fashion Faux Pas at Cannes

NEW YORK (CBS) When you are walking one of the glitziest red carpets at an A-list event like the Cannes Film Film Festival, it might be wise to have a friend - or preferably, a stylist -- view your gown from all angles.

This ruffled white gown may have looked lovely from the front, but as an AP photographer has shown, the view from the rear left something to be desired.

Who was the fashion-challenged star?

Pictures: The amFar Benefit at Cannes

It was Mischa Barton who was wearing this white gown with a ruffled off-the-shoulder neckline, a long train and an Empire waist, belted with black ribbon.

She was attending the 2010 amfAR Cinema Against AIDS benefit at the Hotel du Cap-Eden-Roc, in Cap d'Antibes, southern France, on May 20, 2010. The event is the annual highlight of the Cannes Film Festival.

This year it drew such famous faces as Paris Hilton, Jennifer Lopez and Marc Anthony, Harvey Weinstein, Mary J. Blige, Gerard Butler and Michelle Williams.