Adam Sandler's comedy friends did not take too much persuading to co-star in his latest film Grown Ups, about a group of school friends who reunite 30 years on to spend the weekend together.

Chris Rock, Kevin James, Rob Schneider and David Spade had just as much fun off screen as on, after relocating their families to the set for the summer.

"We had a great time with everybody's family, all the kids got to know each other pretty good," said Adam, who co-wrote the film.

"It was like a summer camp for overpaid actors," added Kings of Queens star Kevin.

Grown Ups also stars Salma Hayek as Adam's wife and Steve Buscemi.