Cameron Diaz Returns To The Red Carpet

LOS ANGELES, Calif. -- With her trademark smile and upbeat demeanor, Cameron Diaz made her first return to the public spotlight since the death of her father Emilio last month, at the premiere of "What Happens In Vegas," Thursday night.

Dozens of fans waved flags emblazoned with "Team Cameron" as the actress - who was decked out in a vibrant red Zac Posen dress - was joined by her costar, Ashton Kutcher, at the red carpet Los Angeles premiere.

[ 'What Happens In Vegas' Premiere, Los Angeles - Play it Now ]

Access Hollywood caught up with Cameron and Ashton to talk about the film the actress previously referred to as "the perfect experience."

"We got to be in New York City into the fall," Cameron told Access. "We had such a great time, the city was amazing and electrifying, and we got to sort of use all the hours of the day to make this movie, which was the only place you really wanted to be."

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Ashton told Access the amount of fun he had with Cameron felt like breaking the law.

"It should be illegal the amount of fun we had," Ashton said. "Actually in Congress right now, once they get done with the steroid thing, they're gonna spend a little time on limiting the amount of fun you can have on a movie set."

[ All Access: Cameron Diaz - Ashton Kutcher - Movies - Celebrities ]

Though Cameron and Ashton had loads of fun filming "What Happens in Vegas," Ashton told Access he restrained his inner prankster.

"I had to lay back," the host of MTV's prank series "Punk'd" told Access about not punking Cameron. "I know better with this one. I don't want to see what she would do in retaliation."

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"He knows what would of happened," Cameron said with smile.

Catch Cameron and Ashton in "What Happens in Vegas" opening on May 9.

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