Tim McGraw was terrified to do comedy and wife Faith Hill had to talk him into doing the smash Four Christmases.

"He says, 'I don't wanna do this. I'm scared. I don't wanna do comedy,'" Faith told The Boot. In the film, the 41 year-old country superstar plays Vince Vaughn's brother and an amateur cage fighter. "I said, 'You have to do comedy.' Just the script alone -- I was on the floor reading it."

The picture grossed a strong $32 million over the weekend. That's a lot better than Hill's one-and-only acting stint, as one of the Stepford Wives in the flop 2004 film.

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