I watched this movie in the past... it's about a girl who killed her sister to take her place in the social circle but a look alike of the dead sister comes into play and brings out that the girl killed her sister. The crazy girl who killed the sister applies lip gloss on her lips throughout the movie it's some sort of obsession in the end of the movie the crazy girl is in an institution. I thought Jenna Dewan played the crazy girl but can't find this movie please help it's bugging me.

The In Crowd (2000) (http://www.imdb.com/title/tt0163676/reference)

Oh my gosh yes it's the movie I was talking about thank you it's been bugging me for a few days I just couldn't think who played in it the title and I've tried to look it up unsuccessfully thanks again I appreciate your help. I'm amazed you were able to give me the correct movie with what info I gave you.