Mischa's Friend Comes Out to Play

Posted May 18th 2007 4:40PM by TMZ Staff

There are nip slips -- and then there are full-out boob slips. Mischa Barton gave us the latter.

The former "OC" star was enjoying a night out in London last night, when she returned to her hotel with a male friend. Her top came undone (ya think?!) and gave photogs a little peek before she quickly buttoned up.

Welcome to the club, Mischa.