Elle Macpherson Reveals Her Beauty Tips and Tricks

— -- Supermodel Elle Macpherson has graced the cover of countless magazines, including a record five times on Sports Illustrated.

Now 50, the model who became known as "the body" is showing that she's still got it: On Tuesday, Macpherson tweeted a photo of herself looking lean and toned in a bikini.

ABC News' Sara Haines asked Macpherson about her beauty tips and tricks.

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"You know, when you laugh it changes everything -- it changes your spirit and the way people receive you, an alkaline diet which I swear by," Macpherson said.

She added that she prefers an "alkaline diet" consisting mostly of "vegetables, a little bit of fish, not much protein, no coffee, alcohol."

The 6-foot-tall Australian also swears by exfoliating, moisturizing every day and sleeping for at least eight hours.

"One of the biggest beauty tips -- and I know it's a cliché - is I drink three liters of water a day," she said.

As for her workout regimen? Macpherson said she does not go to the gym.

"I'm Australian and I've always done a lot of sport, whether it be surfing or running or hiking, road biking … it's not really just about making sure you look thin but it's actually that you enjoy doing," she said.

In addition to her storied modeling career, Macpherson is a businesswoman and designer. She has just launched a new line of intimates called The Body with retailer JCPenney.

Macpherson said she is designing the line for "every woman.

"I think today women choose lingerie because ... it's about feeling feminine, feeling sexy and feeling comfortable in your body," she said.