Revenge of the Girl with the Great Personality

Lexi has a controlling mother who's obsessed with beauty pageants, her sister is a brat, her dad is distant, and Lexi herself is in a rut. She doesn't think much about herself, and she's consigned herself to live apart from the "Beautiful Ones" at school, deliberately putting no effort into her appearance to defy the stereotype of the standards of teen beauty. But when she and her best friend Benny make a bet, she gets glammed up for one week at school. Things kind of go off the rails from that point onward.