Courteney Cox says Matthew Perry 'relied' on being funny during 'Friends' filming for his 'self-worth'

Courteney Cox opened up about how much "pressure" Matthew Perry put on himself to make the studio audience laugh during "Friends" filming in a recent interview.

"That was a lot of pressure he put on himself," Cox, 57, told the Sunday Times. "That's a lot to think how much he relied on that for his own self-worth."

"He just struggled for a while. I think he's doing great now."