I just watched this movie the other night on HBO and found it surprisingly entertaining. It stars the gorgeous Megan Fox as well as the also beautiful Amanda Seyfried. If you haven't seen this movie, skip this entry because I'll spoil it for you. It's part chick flick, part horror film. The story goes that Jennifer (Fox) and Needy (Seyfried) and high school students and were childhood best friends, although in their adolescence they have drifted apart. Jennifer, a common element in any high school, is beautiful, popular, two-faced, bitchy, and kind of a slut, but also deeply insecure, unsure of herself, and doesn't have many close friends. In fact, though not as close as they used to be, Needy would be the closest thing to a BFF she has.
When a mediocre indie band comes to perform at a high school band, Jennifer gets rather friendly with them, even throwing out the falsehood that she is a virgin (which Needy explains later hasn't been true since junior high). Later that night, Jen goes for a ride with the band in their old van and becomes worried when she notices the abundance of occult paraphernalia. When they refuse to let her leave the van, she panics and they restrain her, then taking her to a small cliff out in the woods overlooking a waterfall. There, they gag her and bind her to a large, table-like stone before explaining that they plan on using her as a virgin sacrifice to procure their fame. She is then stabbed multiple times and bled after a short incantation.
Jennifer later explains to Needy that she somehow found her way back to her childhood BFF's house, but along the way she ripped apart and ate a foreign exchange student. Apparently Jennifer was resurrected, but she has a deep feeling of hunger that can only be sated by human flesh. After she has been filled, her skin is bright, her hair is shiny, and she can endure great wounds that heal within moments. When she is empty, she becomes weak and ugly... Well, ugly for Megan Fox anyway (which isn't bad at all).
After a series of local murder/mutilations, Needy begins her own research into the occult and discovers that the original ritual that turned her childhood friend into a flesh hungry monster should have left her dead... If she had been a true virgin. Since she was no longer an unopened flower however, she became a demon of sorts. The only way to slay the demon is to stab it in the heart when it's hungriest.
Long story short, Jennifer kills Needy's boyfriend, Needy kills Jennifer (but not before being bitten on the shoulder) and is put away in a mental institution. Then she breaks out (using what appears to be super-human strength) tracks down the crappy band that started this all, and kills them in their hotel room before making a quiet getaway. Go Needy!