Princesses just want to have fun. 

This spring, Mia's determined to have a good time, despite the fact that the student government over which she presides is suddenly broke. Fortunately (or unfortunately, depending on how you look at it) Grandmère has an elaborate scheme to simultaneously raise money, catapult Mia to theatrical fame, and link her romantically with an eligible teen bachelor not her boyfriend. It's no wonder that Michael, the love of her life, seems to think she's a psycho, or worse: not much fun. 

Is it possible that Mia, soon-to-be star of the stage, president of the student body and future ruler of Genovia, doesn't know how to party? (From Shelfari)