[Unfortunately the YouTube clip I describe from the film On the Avenue is no longer available.] No, that's not Irving and Mildred in the clip; it's Dick Powell pitching ardent woo and singing You're Laughing at Me to a certain "Miss Hasenfeffer" in the 1937 movie On the Avenue. The Irving of my title is the songwriter, last name Berlin.
P.S. I recently learned, by accident and to my surprise, that Mildred's Says My Heart, recorded with the Norvo band and a particular favorite, was one of her biggest commercial successes, staying atop the pop charts for four weeks in 1938. I'm not sure why this should make me feel good 74 years after the fact -- a ton of junk records also were #1 -- but it does.