Mischa Barton Nipple Slip Pictures

Last night Mischa Barton attented the Fashion For Relief show at the Natural History Museum in South Kensington. But she put on even a more interesting show of her own when she inadvertently flashed a boob at the taxi driver after popping out of her dress. The  22-year-old actress quickly covered herself up and buried her head in her hands as the car pulled away.