Producers have added a little more estrogen to the cast of Iron Man 2.

Entertainment Weekly has confirmed that Scarlett Johansson has been cast to play the Russian femme fatale Black Widow in the highly anticipated sequel. She joins fellow castmates Robert Downey Jr., Gwyneth Paltrow, Samuel L. Jackson, Don Cheadle and the just-announced Mickey Rourke, according to E! Online.

ScarJo was first approached for the role after Emily Blunt stepped down due to obligations to the film Gulliver’s Travels, an adaptation of the classic tale toplined by Jack Black.

On her GOOP.com newsletter on Thursday, Paltrow said, "I can’t wait to start Iron Man 2 in two weeks and hang out with him [director Jon Favreau] every day."

Iron Man 2 hits theaters on May 7, 2010.

SCARLETT’S STYLE EVOLUTION:
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