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Naked Megan Fox: WATCH The 'Jennifer's Body' Trailer

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Megan Fox plays a sexy cheerleader gone bad in the upcoming dark and grisly comedy 'Jennifer's Body.' When her character becomes possessed by a demon, she starts to murder her male high school classmates, often while nude and covered in blood.

The movie, written by 'Juno' scribe Diablo Cody, is set to release September 18.

WATCH: