The Shakespeare In Love star admitted that she is not as nice as people think.
"Oh yes, I can be mean," she told Vogue. "I can cave in to gossip. I can ice people out and I can definitely harbour revenge.
"In fact, I'm having a situation right now with a friend where I'm feeling angry. But revenge is corrosive. I'll wake up in the morning and think, 'Ugh, I feel terrible', and suddenly realise, 'Ah, that's why. I'm holding on to so much hate'."
Paltrow offers lifestyle advice through her Goop.com newsletters.