It's Halloween in the Hollywood Hills, and Kat Dyer's going to have the sexiest costume for a night of shameless debauchery. However, Kat's plan is derailed when the costume shop screws up her order and gives her a costume that is the polar-opposite of sexy. Deciding it's better to be temporarily ugly and seen than beautiful and quickly forgotten, Kat attends the biggest party of the year, only to awaken with the strangest post-Halloween hangover...