Tim McGraw's Ground Rules for Gwyneth Paltrow's Son to Woo His Daughter

Tim McGraw's Daughter to One Day Wed Gwyneth Paltrow's Son
Gwyneth Paltrow and Tim McGraw in Country Strong
Sony Pictures

updated 12/15/2010 AT 01:00 PM EST

originally published 12/15/2010 AT 12:00 PM EST

Gwyneth Paltrow's son Moses, 4, might be head over heels for Tim McGraw and Faith Hill's daughter Audrey, 9. But that doesn't mean he can just run off with her.

Asked by PEOPLE on Tuesday about Paltrow's prediction that the kids will get married one day, McGraw replied: "That's what I hear. That's what I hear. Well, he better make a lot of money!"

McGraw, 43, was speaking at a special screening in Los Angeles of Country Strong, in which he and Paltrow both star. The two families grew close while filming in Nashville – and Gwyneth and Faith developed a good friendship, says McGraw.

"They just enjoyed each other," he says. "The kids really had a great time, and we all had a lot in common."

Paltrow and Hill would even head out together in the evenings, leaving McGraw to hold down the fort with his three daughters.

"I babysat the whole time," he says. "Faith and Gwyneth went out and partied. I didn't get to go out. … I was tired! So they went out. They had a good time."

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