IESB posted a short article about a visit they had to the Iron Man 2 set. Here is what they had to say about Scarlett:
We also had the pleasure of meeting with Black Widow herself, Scarlett Johansson, who was absolutely drop-dead gorgeous in her costume.
She’s definitely going to give these boys a run for their money in this film! With a skin-tight black outfit and curly red hair she not only looked the part but was doing all of her own stunt work as well.
If you’re interested in the full article, you can view it here.