Actress Mischa Barton has vowed to remain single until she finds a more "mature" boyfriend. The former O.C. star split with rocker Cisco Adler in February (06), and the 21-year-old insists she's now on the lookout for intellectual suitors, not immature men. She says, "I'd like someone who makes me laugh. I like an intellectual guy, because I love to read. If they like movies, books and music, we're pretty alright. "And I'd like someone who's mature; God, I can't take another immature person!"