Scarlett Johansson Iron Man 2 black lingerie

Scarlett Johansson steams up the screen in a sexy black bra and matching boy shorts.

"Iron Man 2" may not exactly be the kind of material that will nab Scarlett Johansson an Oscar, but her character's lingerie definitely deserves an award for Best Supporting Role.

In one sexy scene from the blockbuster Marvel movie, Johansson, who plays sexy double agent Natasha Romanoff (aka Black Widow), is shown in an old modeling shot, posing provocatively in Panache lingerie's black "Eliza" balconette bra ($68) and boy short ($28). The undercover spy's underthings are hot enough to make Iron Man melt.

Eliza balconette bra boyshort Panache

"Eliza" balconette bra and boy short by Panache. Photo courtesy of Panache

"Panache bras make the perfect foundation for every outfit," Johansson says of the British lingerie line, which is available at HerRoom.

It's no surprise that Johansson's assets look outstanding on screen. To get in shape to play butt-kicking, catsuit-clad Black Widow, the actress stuck to a high-protein diet ("So much turkey and eggs -- ugh, it was horrible!" she told Entertainment Weekly) and worked out with trainer Bobby Strom, doing strength training, and balance and core work.

"Black Widow is a character that any red-blooded male is going to love," says "Iron Man 2" screenwriter Justin Theroux, "and Scarlett was the perfect person to fill those shoes."

Not to mention those underthings.

For her part, Johansson feels this role has boosted her to a whole different level career-wise. "I'm 25, and for some time I've played these characters who are kind of figuring it out, transforming from young girls to young women," she tells V Magazine's Summer Scorcher issue. "I don't feel like a girl anymore."

Trust us, Scarlett, you certainly don't look it, either!

In related news, find out which celebrity designer Gwyneth Paltrow wore to promote "Iron Man 2."