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Gwyneth Paltrow, Queen of Goop, is opening up to Vogue about her tendency to be a mean girl.

"Oh yes, I can be mean," she tells the mag (via The Telegraph). 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 pretty angry," Gwyn admitted, fueling speculation that former BFF Madonna has become a frenemy.

The two famously shared a trainer, Tracy Anderson, who is now Gwyneth's business partner in a new gym venture, until. "Yeah, it's good that she doesn't train Madonna any more. It was too much. She keeps people waiting - it takes up your whole day," Paltrow snarked.

Although Gwyneth didn't address rumors that her husband Chris Martin was cheating on her with Kate Bosworth, she did admit to being so angry, that it was affecting her being. "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.'"

Is "hate" a word you'd really use for a friend? Or would that be reserved for, oh, let's say, a cheating spouse?