How many movies have Betty Van Allen and Edwin B. Willis collaborated on?

They have worked on 2 movies together! Their first movie together was Ziegfeld Girl (1941) while their highest rated movie together was Singin' in the Rain (1952). They have not worked together since Singin' in the Rain (1952).

Role
Singer in "Ziegfeld Girls" Number (uncredited)
Crew
Set Decoration