Everyone in the theater seems to have noticed it. It's really quite flattering.
4 seconds sound clip from the Phantom of the Opera (1943) movie soundboard.
You can hear this line at 00:10:52.803 in the Blu-ray version of the movie.
Quote context
[...]
- Good evening. Monsieur Villeneuve asked that you come in now.
- Thank you, mademoiselle. Thank you.
- Mademoiselle? May I speak to you for a minute?
- You weren't on the stage tonight for the third-act curtain calls.
- Everyone in the theater seems to have noticed it. It's really quite flattering.
- Of course. But Monsieur Villeneuve is waiting.
- Yes.
- You weren't ill, were you? You're not in any trouble? Oh, it's impertinent of me, I know, but, uh...
[...]