The Hollywood beauty plays the superhero's love interest Pepper Potts in the action franchise, and in the upcoming third installment she gets to put on Downey, Jr.'s Iron Man costume.
The Shakespeare in Love star admits she was wary of donning the superhero suit after hearing Downey, Jr. constantly complain it is too hot and uncomfortable, but she was shocked at how easy wearing it was once she got on set.
Paltrow tells U.K. talk show host Graham Norton, "I get to wear the Iron Man suit for a while - it's very cool... It's quite cumbersome but not so bad. I thought it was going to be terrible because in the first two movies Robert would put on the suit and start sweating, he'd have a nervous breakdown and would meditate and cry. He was in hell. So, I was like, 'Wow, I'd better start mentally preparing myself for the suit,' and I put it on and was like, 'This guy is a wimp, it's really not that bad.'"