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Scarlett Johansson worked out and dieted like crazy to look good in the skin-tight lycra catsuit she wears to play Black Widow in Ironman 2.

"I kicked some major butt," Johansson, 24, told People. "It was many, many, hours, days, and months of stunt training and strength training," says Scarlett. "But it's fun because I had a goal. The goal was the Lycra catsuit."

In Ironman 2, Johansson plays the gorgeous fictional super-spy Black Widow (a.k.a.- Natasha Romanoff). The role required the usually un-athletic Scarlett to do stunt work in several complicated acrobatic battle scenes.

Dressed to Kill

"I think people are going to be very impressed when they see her," says Iron Man 2 director Jon Favreau. "It's totally different than anything you've seen her do before."

Favreau was also impressed by Scarlett's dedication to the action-oriented Black Widow role. "She was wearing an unforgiving costume," he says. "[Scarlett] didn't eat much, that's for sure. She likes food, as do I, and she was definitely on a low-carb diet and training very hard. It was amazing."

ScarJo's Hubby's a Superhero Too

Meanwhile, ScarJo's hunky husband, Ryan Reynolds recently landed the role of DC Comics superhero, the Green Lantern. Earlier this year, the superfit 6'2" Reynolds played Deadpool in the action flick X-Men Origins: Wolverine, starring Aussie hunk Hugh Jackman. Thanks to the film's staggering box office (it has grossed over $364 million worldwide since May), Reynolds is set to reprise Deadpool in his own spin-off.