Looks like Scarlett Johansson won’t be an Iron lady. Robert Downey Jr. already has his hands full with two gals, following recent casting news that Jessica Chastain will be joining Gwyneth Paltrow in vying for the star’s attention in ‘Iron Man 3’. But is three a crowd? Possibly so, says ScarJo. The actress, who memorably slinked her way into ‘Iron Man 2’ as catsuit-clad Black Widow, reportedly tells Screen Rant that she will not be returning for the blockbuster franchise’s third outing. Hear that? That was the sound of a gazillion fanboys’ hearts sinking. Casting for the flick has been ramping up, and it’s recently added thespians like Ben Kingsley and Guy Pearce, in addition to Chastain. There’s be no indication so far, though, that Johansson will be making a return engagement. The actress-who’ll be unleashing her killer Black Widow moves in ‘The Avengers’, hints that she’d be more that game for a Black Widow spin-off. “I personally think there’s an awesome Black Widow movie in there, that is like a kind of Bourne type of film, that would take the whole comic book genre in a completely different direction,” she said. “I’ve spoken to Marvel about it—there’s so much story there to draw from. I think it would be totally awesome,” she added.