Megan Fox is in it for less than 2 minutes and has no dialog
From an interview with Thomas Dekker:
"The main reason Megan Fox and Rumer Willis--who are friends of mine--are in the film is a game with the audience. They don't even have dialogue. They're on screen for a total of 25 seconds to two minutes. They offered to play roles, but, the reason I did it like that was because I wanted to play with the fact that everybody--and this is exactly what has happened--is concerned with whether Megan shows her tits and "that Rumer girl is so ugly that I wonder what she does in it." I knew that would happen and my hope was that these idiots who would go to the movie to see Megan's tits and make fun of Rumer will find out neither of them are really in the movie. If you want to see the movie for the movie, you're not going to miss them; but, if you're coming to ogle over celebrity, I'm not going to give them to you. "
Here is the entire article:
http://twitchfilm.com/2010/04/all-about-evil-interview-with-thomas-dekker.html