You can't go to the ball looking like that.
4 seconds sound clip from the Cinderella (1950) movie soundboard.
You can hear this line at 00:43:18 in the Blu-ray version of the movie.
Quote context
[...]
- Nothing, my dear? Oh, now you don't really mean that.
- If you'd lost all your faith, I couldn't be here. And here I am.
- Oh, come now. Dry those tears.
- You can't go to the ball looking like that.
- But we have to hurry, because even miracles take a little time.
[...]