无声电影时代，演员的形体远远比声音重要。琳娜（简•哈根 Jean Hagen 饰）就是凭着讨好的外形，和唐（吉恩•凯利 Gene Kelly 饰）成为大受欢迎的明星搭档。然而，随着技术的发展，有声电影问世，这就难倒了声音及其难听的琳娜。无论如何训练，她都不能把台词念得漂亮。于是，唐请来了声音甜美的凯西（黛比•雷诺斯 Debbie Reynolds 饰），让她做琳娜音乐剧幕后的配音者，令琳娜的演出声名大振。而走红的琳娜更加目中无人。唐经常与凯西、好友科斯莫（唐纳德•奥-康纳 Donald O'Connor 饰）合作无间，唐更与凯西擦出火花，两人相互倾慕。一场大雨给了唐无限的灵感。然而他如何让才艺俱佳的凯西得到应有的名誉和地位？

When a popular radio singer is knocked unconscious during a robbery, a squeaky-voiced college boy fills in for him. To everyone's amazement, especially his recent girlfriend, who just broke up with him, he becomes an overnight sensation.