贝卡（安娜·肯德里克 Anna Kendrick 饰）率领的巴顿大学阿卡贝拉女子美声合唱团终于出人头地，应邀为美国总统的生日宴会光荣献唱。谁知表演期间，“胖艾美”（蕾蓓尔·威尔森 Rebel Wilson 饰）竟意外走光，引起全场恐慌，令合唱团蒙上不雅污名，更被禁止公开演出！力挽狂澜的最后机会，就是赢得阿卡贝拉世界锦标赛的冠军，她们能否战胜来自德国的劲敌，挽回失去的名声，称霸阿卡贝拉的世界……The Bellas are back, and they are better than ever. After being humiliated in front of none other than the President of the United States of America, the Bellas are taken out of the Aca-Circuit. In order to clear their name and regain their status, the Bellas take on a seemingly impossible task: winning an International competition no American team has ever won. In order to accomplish this monumental task, they need to strengthen the bonds of friendship and sisterhood, and blow away the competition with their amazing aca-magic! With all new friends and old rivals tagging along for the trip, the Bellas can hopefully accomplish their dreams once again.