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© WENN / Michael Carpenter
Speaking to MTV, the 37-year-old said that she and her fellow cast members were shocked by the news that Iron Man 2 has made more than $100m (£66m) at the international box office.
"It's funny. It's great. It's been a great experience to be in a movie that is so monstrously huge," Paltrow said.
She added: "This movie made $100m in its first weekend and I think my biggest movie had been Shakespeare in Love, which made $100m in its whole [theatrical run] - it was kind of amazing to see.
"How does a movie make $100m in one weekend? So, it was fun to be a part of that."
Iron Man 2 opens in the US on Friday.
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