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Christie Brinkley maintains her supermodel bikini body at 62 with a vegan diet, cardio exercise and yoga workouts. (Mike Coppola/Getty Images)

Christie Brinkley flaunted her smoking-hot supermodel physique at a party to kick off New York Fashion Week on Sept. 6.

Brinkley, 62, dazzled in a body-hugging red dress that accentuated her ageless beauty.

Judging by her youthful good looks, it’s hard to believe Christie has been a fashion icon for 40 years.

Christie said a mostly vegan diet, cardio exercise and yoga workouts are her anti-aging beauty secrets, Celebrity Health Fitness reported.

“I made the decision [to become vegetarian at age 13] because I loved animals and didn’t want to be a part of the slaughter industry,” said Brinkley.

“I’ve been reaping the benefits of that karma ever since. I’ve avoided the constant antibiotic injections into animals and the growth hormones.”

Brinkley joins a growing number of celebrity vegetarians and vegans, including Paul McCartney and Jennifer Lopez, as TheImproper has reported.

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Christie Brinkley said the secret to healthy aging and ageless beauty is diet, exercise and a positive attitude of gratitude. (Coppola, Barnard/Getty Images)

Vegan and vegetarian diets have many anti-aging health and weight loss benefits, said Dr. David Katz, director of Yale University’s Prevention Research Center.

“A diet of minimally processed foods close to nature — predominantly plants — is decisively associated with health promotion and disease prevention,” said Dr. Katz, author of Disease-Proof.

Obesity expert Dr. Neal Barnard agreed. “Studies suggest that free radicals [toxic molecules that form in the body] contribute to aging,” Barnard wrote in his book, the 21-Day Weight Loss Kickstart.

“A vegan diet is full of antioxidants which help protect the body from damage by free radicals.”

Christie Brinkley said being grateful for all the blessings in your life is a key anti-aging beauty secret.

“When you feel good, you look good,” said the mom of three. “Being flexible and grateful contributes a lot to your happiness, which contributes to your health and to your looks.”

Brinkley is also a fan of sunscreen, laser skin treatments, and supplements. “I take vitamins like Biosil for my hair, skin and nails,” said Christie.

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Christie Brinkley takes Biosil to give her healthy, strong hair and glowing skin. (Getty Images).

Christie also exfoliates and moisturizes her skin every day to slough off dead cells and promote cell turnover.

But Brinkley said the most important beauty secret is a positive attitude.

“Attitude plays a huge part in how you feel,” said Christie, who detailed her fitness and health secrets in Timeless Beauty. “Nothing looks better on you than happiness, and that’s in your own hands.”