Estelle Gibbs, out of a job and recently cheated on by her fiance two weeks before their wedding day, finds herself on a drinking binge that even her own best friend couldn't handle.

Left alone in a bar one night, an attractive guy she has never met walks up to her and mistakes her for an old high school classmate. Drunk and desperate for company, Estelle decides to pretend to be that girl—whoever she is—for the night, except they ended up waking up next to each other.