Let’s hear the cat whistles and wolf growls! Scarlett Johansson as Black Widow with red hair, and she is rocking in that black dress, right boys?   

In this production still for Iron Man 2, Johansson is Natasha Romanoff, Black Widow’s alter ego and Tony Stark’s new personal assistant. Natasha and Pepper Pots (Gwyneth Paltrow) fight over Tony, bringing a little bit more drama to the movie.(Source)