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Here's a friendly reminder: Elizabeth Hurley is 51 years old.

But while it's almost impossible to fathom, the secret behind the Royals star's ageless beauty isn't a magical fountain of youth. Say what?

As she reveals in an exclusive interview with E! News alongside costars Alexandra Park and William Moseley, the trick is simply exercise and a healthy diet.

"I like women to feel very confident in how they look and to accept that every size can be beautiful," she says. "But I still think it's important to be in shape. It doesn't matter really what size you are, but I think it's important to stay sort of firm and to do a reasonable amount of walking and exercise. I don't go to the gym, but I'm quite active."

Elizabeth Hurley, Instagram

Instagram

"I hike, I walk with my dogs all the time and I don't really sit still," she continues. "I don't really lie around on the sofa much. I like running around, so I don't feel like I need to be skinny, but I feel the need to be athletic and fit. That to me is the most important thing for people to do."

Elizabeth also makes it a rule to avoid late-night meals.

"I think that's one of the best diet tips you can have to eat your food earlier on in the day, so you've got more time to digest it and your body can rest in the sleep period," she says. "I think that's quite important. I always used to snack late at night because I was a little bit hungry before I went to bed. I stopped doing that now. But I think whole grains and vegetables and fish and small bits of lean meat is really the way I tend to go."

Check out the clip above to get the truth behind Liz's many, many bikini Instagram pics!