For 'Swingers' fanatics hoping for an older Mike and Trent in paradise, 'Couples Retreat' isn't it. If anything, Jon Favreau and Vince Vaughn actually switch personas. Favs plays Joey, a womanizing ex-football player, while Vaughn settles into nice-guy mode as Dave.

"It was fun seeing Vince married with kids," says Favreau, who is married himself with three kids. "My own experience is reflected most in Vince's character."

Vaughn, who seemed like a lifetime bachelor, got engaged earlier this year (to real estate agent Kyla Weber). Still, he already saw himself as playing a stable married man about three years ago when he approached his 'Swingers' co-conspirator with the concept.