Christie Brinkley
is one hot mama!

The 59-year-old former supermodel posted a series of snapshots on Instagram this week, posing in a white bikini while vacationing with her family over the holidays.
"Peace!" the blonde beauty wrote, along with a photos of her daughter Sailor Lee holding up a peace sign.

Brinkley looks amazing in her two-piece, so how does the mother of three maintain her fit figure? She says a healthy diet is key to keeping weight off.

"For many, many, many years I've always said I go for as many colors as possible in a day," Christy told Shape magazine. "That's my main concept for making sure my kids get all the nutrients -- making sure they get the deep greens, yellows and reds and purples, all of that. That's just an overarching concept to the way I like to eat, along with the whole idea of variety in exercise, variety in food with the colors. I like to vary what I have."

Her diet plan is clearly working!

Click "Launch Gallery" above to see more sexy supermodels, then and now. 

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