Both Olivia Wilde and Amy Smart showed some skin at the 2009 Environmental Media Awards in Hollywood on Sunday. Which star looks sexier? More photos after the jump...

Olivia was told her career would flop if she didn't lie about her marital status. She got married when she was just 19 and admits casting bosses advised her to hide her relationship so she would appear attainable to male fans.

Proving herself to be a major sex-symbol, Amy's topless scene in the comedy Road Trip shot her to movie stardom.

Image © Tony Lowe / PR Photos