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Diaz, looking fabulous in a short, body-skimming coral-toned dress and high black pumps, also happily greeted the film’s other co-stars, Lake Bell, Dennis Farina, Treat Williams and Rob Corddry, with big hugs and kisses. Kutcher, who apparently left wife Demi Moore at home with the kids, looked sharp, too, in a dark plaid jacket and slacks.

But despite the fact that Ashton did not bring his wife along to the premiere of the romantic comedy about a couple that marries in Vegas the night they meet, then immediately regrets it, he made it clear to reporters at an earlier press day to promote the film that in his personal life, he has no such regrets.

"I never thought in my life I would get married," the 30-year-old admitted. "I watched my parents go through a divorce and I thought ‘This is just not what people are supposed to do.'"

But then his path crossed with Demi Moore, and all bets were off.

"I never really understood the whole idea of marriage until I met my wife. I just knew that was the person I was going to be with for the rest of my life. I knew that I had that desire. I took the time then to understand it a little bit more of what it was about and I love it," he said. "I might be the most happily, I don’t know if happiliest is a word, I just made up a new word. I am the happiliest married man on the planet."