Scarlett Johansson has signed up to star in Iron Man 2. The “Match Poin” actress will portray a Russian super-spy Black Widow, her rep Marcel Pariseau announced on Wednesday (March 11). The star-studded cast includes the likes of Mickey Rourke, Gwyneth Paltrow , Samuel L. Jackson and Don Cheadle. Scarlett took the role after Emily Blunt backed out due to schedule commitments, reports Entertainment Weekly. The Iron Man sequel is slated to hit theater in May 2010.
