Mischa Barton and Brett Simon in LA

Mischa was caught kissing a new boy in LA yesterday however this is not her supposed new boyfriend, Brett Simon. Considering she looks like she's in costume we're thinking maybe this guy is a co-star but you never know with Mischa these days. From the headband I'm guessing it's not that Gossip Girl role she just turned down. Between Mischa's flower child look and Rachel Bilson's tough girl image, it's clear the ladies from The O.C. are looking for some change these days.