Actress Gwyneth Paltrow was the center of attention when she appeared on the red carpet in Los Angeles on Wednesday night wearing no underwear.

The 40-year-old, who was just crowned the 2013 Most Beautiful Woman in the World by People Magazine attended the premiere for her latest film, Iron Man 3 wearing a black and white Antonio Berardi dress with sheer sides.

She showed off her sexy athletic legs and even gave a small peak at her butt.

Paltrow was all smiles as she walked the red carpet with a pair of silver platform heels. She wore her hair in a natural style, letting it flow down her back and completed the look with a pair of huge statement earnings and a bright pink nail polish.

The actress was joined her co-star Robert Downey Jr. who was dressed in a nerdy look, wearing a navy blue suit with his trademark glasses. Downey made a grand entrance to the carpet in a bright red sports convertible car.

Other stars of the movie who joined the red carpet included Rebecca Hall and Sir Ben Kingsley.

In an interview with ABC's Good Morning America Thursday, Paltrow said she loved playing Pepper in the movie.

"I think she's wonderful, I love playing her, and especially in this one," Paltrow said.

The movie comes out May 3, and Paltrow says Pepper's relationship with Tony Stark, will captive men and women.

"Pepper and [Tony Stark], their relationship in this movie is very interesting. It's very real and you see some of the strain, but it ends up being a very romantic story. I think for women especially they will enjoy this film the most because there's a really fantastic element and there's also a lot of .... girl power."

As for as being named the Most Beautiful Woman by People, the actress credits her agelessness and beauty to health and fitness.

"It makes me look younger and feel strong," Paltrow said. "When I first started, I thought, 'I'll never be good at this. This is a nightmare!' But now it's like brushing my teeth, I just do it."

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