Also, of interest is that this is the third feature by Karyn Kusama, whose film "Girlfight" took the 2000 Sundance Grand Jury prize.
The plot goes like this:
The film follows Jennifer, a cheerleader possessed by a demon who begins feeding off the boys in a Minnesota farming town. It is then up to her "plain Jane" best friend Needy to kill Jennifer, escape from a correctional facility and go after lead singer Nikolai and his Satan-worshiping rock band responsible for the transformation.
(Read indieWIRE's interview with Karyn from way back in 2000.)