Gwyneth Paltrow says sex is her secret to looking good.

She told PEOPLE: "I think it's really important to be happy, and I think women get happy by being authentic. But I also believe in exercise, eating well, drinking lots of water, sex, sleeping and being around people who make you feel good.

"And I think that glow that you get in life comes from a combination of all those things."

Meanwhile, Gwyneth's ex-husband Chris Martin - the father of her daughter Apple, 11 and son Moses, nine - recently praised the actress for going out with him when they first met in 2002.

Coldplay frontman Chris, 38, said: "Gwyneth and I are really good friends. I think she was really lovely to take a chance on an unripe banana.

"Gwyneth and I broke up a long time ago. I know I am in a band that is famous and my private life is famous and it's fine.

"Even when I grew up in a village, people wanted to know who was going to the dance with whom, and I understand, but I think if I engage with it too much it won't be that healthy. That whole period was a real blessing and I'm so grateful for it but you want to keep certain things to yourself."