Rachel's Reflective Surfaces (2003)

Go to 2m 50s in. (There's some recent problem with youtube coding for start-times of embedded videos that prevents this from happening automatically.)

Who's the mocking, blonde cutie in Stage Door (1937)?

Update 2019: The mystery gal is Jan Wiley, credited as Harriet Brandon for Stage Door and for her debut, New Faces of 1937. Wiley succeeded as a serials star throughout the '40s.