(CBS) "What Happens In Vegas" doesn't always stay in Vegas, as a new comedy starring Cameron Diaz and Ashton Kutcher proves.

The movie, which opens Friday, has their two characters excessively indulging in what Sin City has to offer -- including a quick, easy wedding -- then fighting over a $3 million jackpot they won. It leads to a judge sentencing them to "six months hard marriage," after which they get to split the money.

Kutcher and Diaz joked with co-anchor Maggie Rodriguez on The Early Show Thursday that it was awful working with one another.

"I had to see her every day and it was like a nightmare!" Kutcher kidded.

"It was hard!" Diaz chimed in.

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Photos: Kitcher, Diaz On PR Tour

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On a serious note, Kutcher says Diaz is not only the happiest person on the set each day, "She delivers behind that." She calls him "a powerhouse of energy and excitement and energy.

They also talk about the relationship among Kutcher, real-life wife Demi Moore, and Diaz, and he talks about his marriage.

At one point, Rodriguez and Kutcher even dance together.

To see the interview, click on the arrow in the image below.

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