Actress Mischa Barton apparently suffered a wardrobe malfunction Wednesday night, flashing a breast while leaving a fashion show in London, photos reveal.

The star's breast apparently slipped out of her red-and-gold satin evening gown as she jumped into a taxi after the Fashion For Relief show at the Natural History Museum in South Kensington, London, the Daily Mail reports.

Click here to see photos (Warning: photos contain nudity.)

The 22-year-old former "O.C." star quickly covered herself up and buried her head in her hands as the car pulled away, photos show.

Earlier this week, Barton was spotted with actor Josh Hartnett at trendy club Bungalow 8, however the "Pearl Harbor" star has since denied rumors of a romance.