Yes, Rachel McAdams may play one of the mean girls in this 2004 comedy, but this movie is still a lot of fun. Starring opposite Lindsay Lohan, McAdams plays the conniving and manipulative Regina George. With a screenplay written by Saturday Night Live's Tina Fey, this is a fun film about high school cliques and social pressure.
If you like this, you might also enjoy 2005's Wedding Crashers, another comedy featuring the lovely and talented actress.