Shailene Woodley recently opened up to Into The Gloss about following a natural lifestyle, which includes some unusual beauty habits. She admits to eating clay, washing her hair just once a month, going make-up free, and making sure her vagina gets enough sun.

She explains: "Another thing I like to do is give my vagina a little vitamin D. [Laughs] I was reading an article written by an herbalist I studied about yeast infections and other genital issues. She said there’s nothing better than vitamin D.

"If you're feeling depleted, go in the sun for an hour and see how much energy you get. Or, if you live in a place that has heavy winters, when the sun finally comes out, spread your legs and get some sunshine. [Laughs]"

Woodley also started consuming clay on the advice of an African taxi driver. "I've discovered that clay is great for you because your body doesn't absorb it, and it apparently provides a negative charge, so it bonds to negative isotopes," she says. "And, this is crazy: it also helps clean heavy metals out of your body."

The actress cut her hair for the film "The Fault in the Stars," and it makes her beauty regime a lot easier. "I only shampoo it like once a month—the oilier, the better," she insists.

You can see Woodley in the sci-fi film "Divergent," which hits theaters on March 21.