Answer
The Roommate is a 2011 American psychological thriller film directed by Christian Alvart and starring Leighton Meester, Minka Kelly, Cam Gigandet, Aly Michalka, and Danneel Harris. It was written by Christina Hodson and Eric Van Wagenen, based on the 2003 novel of the same name by Laura Dave. The film tells the story of a college freshman who becomes obsessed with her new roommate.