We were watching TCM last night. Singing in the Rain was on and at the beginning the stars are doing the red carpet thing and there is a lady doing the Joan Rivers type intros. My lovely wife says...That's Larry's Mom and sure enough, I look it up on IMDB and Madge Blake is Dora Bailey (uncredited).
Imagine that

Madge Blake is in some motion pictures that feature some big stars. Those include: The Tender Trap (Frank Sinatra), The Bandwagon (Fred Astaire), Brigadoon (Gene Kelly), The Bad and the Beautiful (Kirk Douglas & Lana Turner) and The Long Long Trailer (Lucille Ball & Desi Arnez). She was in many many TV shows including an on-going part in The Real McCoys.

I checked her out on IMDB and the poor girl has a pantload of uncredited roles. That's too bad

That is awesome seeing someone way before their famous character playing in B movies and in some cases great films. I was watching I think The Lost Weekend a while back and there was William Frawley (Fred Mertz) much younger in a bit part.