Reagan (Kersten Dunst Kirsten Dunst), Genna (Lizzie Capan Lizzy Caplan) and Katie (Ella Fischer Isla Fisher) are school friends. The frivolity of youth brings fond memories to the three women, but for another girl, Becky (Rebel Wilson Rebel Wilson), things are completely different. It turned out that Becky, who was relaxed and fat, was often laughed at by Reagan and his gang, and they even gave her the ridiculous and stupid nickname "Pig face". As time went by, the news that Becky was about to get married was like a bomb dropped on three women. Not only that, Becky invited them to be her bridesmaids. "Pig face" all had husbands, and three beautiful single women felt in crisis. Reagan decided to throw a bachelor party for Becky before the wedding, but she had no idea what kind of trouble and madness the party would bring.