What episode is it when Chandler says he loves the movie Ms. Congeniality?

It's 10.1 - The One After Joey And Rachel Kiss

First Chandler hears Charlie watching it through the bedroom wall of the hotel.

Monica: If you know it through a wall, then you know it too well.

At the end of the episode, back in New York, Chandler convinces Monica to watch it with him.

Monica: I just don't understand why you like it so much.
Chandler: She's a government agent masquerading as a beauty queen!

Hope that helps.