Hollywood actress Scarlett Johansson has joined the starry list for the sequel of superhero movie 'Iron Man'.
Scarlett Johansson signed up the deal March 12 and has followed in the footsteps of actors Samuel L. Jackson and Mickey Rourke to come onboard for the 2010 project, reports contactmusic.com.
Scarlett Johansson, 24, will play Marvel comics' villainous superspy Black Widow opposite Robert Downey Jr., Gwyneth Paltrow and Don Cheadle in the new movie.
