Scarlett Johansson's sexy ''Iron Man 2'' catsuit was too ''hot.''

The Hollywood beauty - who plays Natasha Romanoff and her alter-ego, Russian spy Black Widow, in the new superhero movie - had no qualms wearing the skin-tight outfit, but worried she would overheat while filming fight scenes.

She explained: "The first time I saw the suit I just thought, 'That looks like it's going to be really, really hot!'"

"Literally - the temperature was very hot."

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Although Scarlett struggled with the stifling temperatures inside the black catsuit, the 24-year-old blonde star wants to reprise her role for another Marvel comic book adaptation.

Scarlett recently said: "The Black Widow has many different incarnations and different storylines so I'm hoping she will be able to continue in that way."

"I'm hoping that if the fans like the character and support the character, we'll see her again."

Scarlett's husband Ryan Reynolds is already in talks to have his own superhero spin-off movie - based around his "X-Men Origins: Wolverine" character Deadpool.