Petula Clark revived her film career in the late 1960s, starring in two big musical films. In Finian's Rainbow (1968), she starred opposite Fred Astaire and she was nominated for the Golden Globe Award for Best Actress - Motion Picture Musical or Comedy for her performance. With her role, she again made history by becoming Astaire's final on-screen dance partner.

Finian's Rainbow is a 1968 Irish/American musical film directed by Francis Ford Coppola and starring Fred Astaire and Petula Clark. The screenplay by E. Y. Harburg and Fred Saidy is based on their 1947 stage musical of the same name. It is a fantasy about an Irishman and his daughter who steal a leprechaun's magic pot of gold and emigrate to the United States, where they become involved in a dispute between rural landowners and a greedy, racist U.S. Senator.

A lovable rogue named Finian McLonergan (Fred Astaire) absconds from his native Ireland with a pot of gold secreted in a carpetbag, plus his daughter Sharon (Petula Clark) in tow. His destination is Rainbow Valley in the mythical state of Missitucky, where he plans to bury his treasure in the mistaken belief that, given its proximity to Fort Knox, it will multiply.

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