18 Movie Stalkers You Should Not F*ck With

Yes, that was Rose Byrne in Wicker Park! She played Alex, a woman hopelessly in love with Matt (Josh Hartnett), her old friend's old boyfriend (it's complicated, we know). Though she's not particularly dangerous, Alex does lie her way into sleeping with Matt, who is slowly going insane at the idea that his old girlfriend might be back in the picture.