What are some good sleepover movies for 13 year old girls?

I'm hosting a sleepover soon, and I need some ideas for what type of movies to show. I'm looking for chick flicks as well as comedies that will make us roll on the floor laughing, and possibly a scary movie. (Not a bloody, gory, or violent one, but a psychological thriller... I don't know if Prom Night is any good?) They have to be PG or PG-13. Thanks.