When Charlie agrees to go to a Halloween keg party as the “girlfriend” half of a boyfriend-and-girlfriend costume with his best friend, Jeff, he has no idea what he’s signing up for. The night of the party, Jeff’s older sister tweezes, squeezes, and transforms Charlie into Charli, a curvy, curly-haired brunette in a flare-skirted red dress. The shoes are hell, but the attention Charli gets at the party—especially from Jeff—goes straight to her head. When Jeff walks her to her door at the end of the night, neither of them is quite ready to give up the act.