Bad Girls from Valley High (movie, 2005)

Brooke, Danielle, and Tiffany are three attractive and popular teenage girls who have risen to the top of the pecking order at their high school, and that's just the way they want things to stay. A sexy exchange student, however, arrives at the school and soon attracts the attention of all the boys -- including Danielle's hunky boyfriend. Not eager to share the spotlight with anyone, the gals decide that the new girl in town needs to be dealt with...permanently.