Three Smart Girls Grow Up is a 1939 American musical comedy film directed by Henry Koster, written by Felix Jackson and Bruce Manning, and starring Deanna Durbin, Nan Grey, and Helen Parrish.

[4] In August 1938 Bruce Manning and Felix Jackson were reported as working on a sequel.

[6] In September, Barbara Read, who had been in the original, was considered "a little too grown up" for the sequel and was replaced by Helen Parrish, who had been in Mad About Music with Durbin.

[8] It halted because Durbin fell ill and resumed on 23 December.

[9] Cummings received a long-term contract from Universal after being cast in the film.