Lost and Delirious (2001)

Cast: Mischa Barton, Piper Perabo, Jessica Paré, Mimi Kuzyk, Emily VanCamp, Amy Stewart, Caroline Dhavernas, Jackie Burroughs, Grace Lynn Kung, Lydia Zadel

After starting at an upmarket boarding school, a teenage girl forms close friendships with her two older roommates. However, when she discovers that her new friends are lovers she finds herself caught…