Gregory Peck was nearly two decades Audrey Hepburn's senior when they co-starred in which 1953 romantic comedy?

Hepburn was a virtual unknown when she landed the part of Princess Ann, a young royal who slips out for an incognito adventure while on an official visit to Rome. By the time shooting finished, her performance had so impressed her co-star that Peck advised the producers they had better move her name above the title as she was certain to win an Oscar. She did.

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