Overweight Wrenn Scott, living with her single mom and younger sister, Karly, desperately wants to be popular and snag a hot boyfriend.
She lands a lead role in the high school musical, her voice for once overshadowing her weight. Pushing to get thinner by opening night, Wrenn’s waistline shrinks as she learns all the wrong ways to lose weight from a new “it-girl” friend in the show.
Geeky stage manager Steven has a crush on her, but Wrenn doesn’t want to be seen with him – she’s holding out for a trophy boyfriend everyone will envy.
By opening night, the old Wrenn has almost disappeared. Things come to a head when a crisis reveals her weight-loss tricks, and Wrenn realizes there are much more important things than being thin, popular, or dating a hunk.