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Wow, Christie Brinkley!

Just when you needed more proof that age is just a number, take a look at Christie Brinkley's bikini body at the age of 61.

The former Sports Illustrated model has still got it, and she's flaunting it while on a tropical vacation with her family. Lucky for us she's been sharing photos on Instagram.

"Snorkel Trip. We saw 4 tortoises, sea fans in purple and yellow, puffer fish, Dory and Nemo fish, schools of colorful fish, and some huge barracudas," Christie captioned a photo of her daughter Sailor and friends. "One of whom chased Jack and me while snapping his Sharp jaw at us! Great undersea adventure!"

She then posted another photo of Sailor, son Jack and a friend with the caption, "Turquoise water is my favorite color!"

But her vacation snaps are not just about the water. Christie also shared her tips for holiday beach-goers. "I used my skin quenching Recapture Day Cream +IRDefense Then on top I put SmashboxCamera Ready Broad spectrum SPF 35 color Medium and Hourglass Radiant Bronze Light just to add a sunny glow," she wrote along with a close up of her face with a snorkel.

Even her buff bikini body shot has a helpful reminder to wear sunscreen. "I am wearing Neutrogena Wet Skin broad spectrum. And I always have a hat!!" she captioned it.

Just be careful on that driftwood, Christie!