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 pre-Code comedy film directed by Marion Gering and starring Sylvia Sidney, Cary Grant and Edward Arnold. The film was based on a story of the same name by Clarence Budington Kelland, adapted by Sam Hellman and Edwin Justus Mayer, and written by Preston Sturges and Frank Partos.