Gwyneth Paltrow called Beyonce "right away" after footage emerged of Jay Z and Solange Knowles fighting in an elevator.

Asked how she reacted to the footage, Gwyneth said: "I never say, 'What's going on?' If any of my friends have anything like that, I call right away. Absolutely... If someone's clearly going through something, I always go straight for it."

The 42-year-old actress - who has children Apple, 10, and Moses, eight, with estranged husband Chris Martin - went on to praise the "funny and sweet" couple but admitted Cameron Diaz is her closest celerity friend.

Speaking to Howard Stern on SiriusXM, she said: "I have some famous friends. And I have mostly not famous friends.

"My best famous friend is Cameron Diaz. Jay and Beyonce are my others. They're the greatest people. They are funny and sweet, and self-aware and really intelligent."

And Gwyneth also praised her "hilarious" friend Jennifer Garner - who is married to her former boyfriend Ben Affleck - for being "warm" and a great mother to her three kids, Violet, nine, Seraphina, six, and two-year-old Samuel.

She said: "I'm friends with Ben still. He settled down, and his wife is awesome!

"Not only is she beautiful, she's so warm and she cooks, and she's so into her kids. She's hilarious... I had a girls dinner before this summer. I really like her a lot."

However, one old friend who the 'Iron Man 3' star is no longer close to is Winona Ryder.

She admitted: "I haven't seen her in years."

However, the blonde beauty insisted speculation they fell out after Gwyneth poached the lead role in 'Shakespeare in Love' from her former friend was untrue.

She insisted: "No, that's an urban myth. I swear to God I did not. I'm raising my hand on the Bible."