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The Lost In Translation actress, who is famed for her blonde locks, has been forced to dye her hair for the part of Black Widow, says The Sun.
The newspaper also suggested that she has been undergoing a tough exercise regime for the role as the gymnastic Russian spy.
Johansson will be joined by Robert Downey Jr, Samuel L. Jackson, Gwyneth Paltrow and Mickey Rourke in the comic book sequel.
> Johansson, Paltrow spar on 'Iron Man' set
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