A high-powered PR professional discovers that her brother is about to marry the woman who made her high school life a living hell in this comedy starring Kristen Bell and Odette Yustman. Back in her teens, Marni (Bell) was a little awkward. These days she's a successful career woman, but the memories of being tormented by popular cheerleader Joanna (Yustman) still make her break into a cold sweat. Flying home for her brother's Will's wedding, Marni realizes to her horror that she will soon be sister-in-law to the pompon-wielding mean girl who once humiliated her in front of the entire student body. And apparently her nemesis learned from the best, because back when Marni's mom (Jamie Lee Curtis) was in high school, Joanna's aunt (Sigourney Weaver) served up the same kind of treatment. Now that they're about to become family, Marni and her mom do their best to let bygones be bygones. But old grudges die hard, and by the time the wedding bells chime, these old foes will already have some saucy stories to share with their grandchildren.