Christie Brinkley is one of the most legendary supermodels of all time. Her career has spanned decades. Brinkley is still looking amazing today, and recently celebrated her 70th birthday. She shared a set of photos on Instagram for the occasion. Brinkley captioned the post, "Looking in the mirror on my 70th Birthday and what do I see, I'm finally happy with the person looking back back at me. I'm no longer critical and demanding now I'm grateful and understanding. I've put this body thru it. I've broken every bone, in tiny miracles I'm all healed, in my heart and soul I'm home. It's taken 70 years to get here, in tears and joy I've found my happy, so now I'm going to end this poem, before I get too sappy! Happy Birthday Indeed!" How does she stay so fit? Read on to see 5 ways Christie Brinkley stays in shape and the photos that prove they work.

Brinkley is open about having work done. She talked about why she chose to have it done to People. "When I look in the mirror, I want to feel like I look as good as I feel. And if you can have something done to feel more confident and better about yourself, then you feel like your face matches your spirit—and my spirit is enthusiastic and energetic."

Brinkley tells People that she doesn't care what people think about her. Especially when it comes to the people who critique her plastic surgery. "There are always going to be the people who build themselves up by pulling you down. But then there are the women who are supporting women. And if there are little things that I can do that are going to make me feel great, make me look good for my job and that would be selfish of me not to share it."

Brinkley has amazing skin, and she makes sure to take care of it. She shared her secrets in an interview with Byrdie. "I start every day by exfoliating my face. That's something I've done for the past 40 years. I feel like it's really contributed to my skin feeling fresh and smooth. Forty years ago, I read an article that said men always look five years younger than women who are their same age. They contributed that to them shaving every day, and the daily exfoliating with shaving their skin makes them look younger. I was like, I'm not going to let them get away with that!"

Brinkley is open about being a vegetarian. She tells Byrdie that she eats a lot of fruits and vegetables. "My diet is plant-based. I've raised my kids on what I call the 'rainbow diet.' I want as many colors as possible. These are all the ingredients that do wonderful things to your skin. The deep green, the leafy greens, the purples in the skin of the grapes, which produce all the antioxidants and vitamins you get from a colorful, rich diet like that."

Brinkley makes sure to eat healthy. She tells Byrdie that she avoids certain unhealthy foods. "I would say avoid sugar as much as possible. It causes inflammation…And can cause all kinds of problems… I think avoiding artificial sugar, avoiding white bread, and going for deep, rich, plant-based foods is best."