Thirty Day Princess

A European princess arrives in New York City to secure a much-needed loan for her country. She contracts the mumps, and an actress who looks exactly like her is hired to impersonate her.

Thirty Day Princess is a 1934 romance comedy movie directed by Marion Gering, starring Cary Grant, Edward Arnold, Sylvia Sidney. It holds an IMDb rating of 6.7/10 from 1,354 votes and runs 1h 14m.