Adam Brody (pictured inside) and J.K. Simmons have joined the cast of Jennifer’s Body, Diablo Cody and Jason Reitman’s follow-up collaboration to “Juno.” Karyn Kusama is directing Fox Atomic’s dark comedy/horror film starring Amanda Seyfried and Megan Fox. Cody’s script centers on Jennifer (Fox), a cheerleader possessed by a demon who starts feeding off the boys in a Minnesota farming town. Her bookish best friend (Seyfried) must take drastic measures to protect the town. Brody will play Nikolai, a hot lead singer of an up-and-coming rock band with a penchant for evil. Simmons will play Mr. Wroblewski, a high school science teacher.