On the night before an old friend’s wedding, three frisky bridesmaids go searching for a little fun but find much more than they bargained for. With lovely Becky (Rebel Wilson) set to marry her handsome sweetheart, Dale (Hayes MacArthur), the remaining members of her high school clique reunite for one last bachelorette bacchanal in the Big Apple. Regan (Kirsten Dunst) is an overachieving, über-Maid of Honor who’s secretly smarting over the fact that she’s not the first to marry, while Gena (Lizzy Caplan) is a whip-smart sarcastic who’s actually a closet romantic, and Katie (Isla Fisher) is a ditzy beauty who loves the good life. But when Becky insists on keeping the bachelorette party tame, the women proceed with an after-hours celebration of their own. Things get very wild very quickly, sending the unholy trinity careening across Manhattan with a torn wedding dress in tow, bum-rushing a drycleaner’s, charming their way into a shuttered tailor’s, and crashing Dale’s bachelor party. It’s there that Regan meets her match in white-collar hedonist Trevor (James Marsden), Katie gets pursued by former classmate, Joe (Kyle Bornheimer) and Gena finds herself drawn to old flame Clyde (Adam Scott). Will the girls get through the night alive? Can they fix the dress, be there for Becky, and get to the ceremony on time? Time is ticking away, but the bachelorettes are only getting started in what proves to be a life changing weekend they will never forget.