Looked up those two girls, Clare Kramer sort of looks like the blonde American answer to Jenna Louise Coleman.

You know, I don't know if I've ever actually seen this movie all the way through.  I'm definitely familiar with elements of it, though (Eliza as the punk chick, the alleged stealing of the choreography, "cheer"-ocracy).   I remember another cheerleader movie, Fired Up!, where all the cheerleaders were gathered at camp to watch the movie and they were all lip synching with the entire movie.