As the Iron Man 2 cast and crew put in long hours getting the blockbuster sequel shot, director Jon Favreau shared to his Twitter readers what happened on Wednesday (May 06) when sultry Scarlett Johansson stepped on to the set for the first time in costume for her character Black Widow. “Scarlett’s first day on set in the Black Widow outfit,” Favreau wrote. “You’ve never heard a crew get so quiet so fast.” Johansson took on the role after Emily Blunt dropped out due to a scheduling conflict. Fans of the franchise were up in arms at the casting change citing that Johansson did not physically resemble the character. But after a quick dye job on Johansson’s part, it looks like she’s ready to smoothly slip into character as a Russian spy. Thanks to Radar.com for this news!