Adam Brody and J.K. Simmons have joined the cast of the dark comedy/horror feature Jennifer's Body, the follow-up to Juno by writer Diablo Cody and director Jason Reitman.

Cody's script centers on Jennifer (an always-hot Megan Fox, pictured), a cheerleader possessed by a demon who starts feeding off the boys in a Minnesota farming town. Her bookish best friend (Amanda Seyfried) must take drastic measures to protect their town.

Brody will play Nikolai, a hot lead singer of an up-and-coming rock band with a penchant for evil. Simmons plays Mr. Wroblewski, a high school science teacher.