Christy Brinkley, 61, Shows Off Smokin' Hot Bikini Bod on Family Vacation

Christy Brinkley showed off her incredibly fit beach bod while spending some fun in the sun with her family.

The blonde bombshell put her tiny waist on display in a purple graphic bikini top and sarong as she explored the tropical locale. She even shared a few of her beauty secrets on Instagram.

"I am wearing Neutrogena Wet Skin broad spectrum," she wrote. "And I always have a hat!! For more tips on diet,exercise, hair make up etc check out my new book Timeless Beauty now available in book stores everywhere! @brinkleybeauty #timelessbeauty."

The sexy supermodel was joined by her equally-gorgeous kids, Sailor and Jack, for a family friend's wedding.

The proud mama shared a sweet snapshot with her mini-me daughter -- and the two look like twins!

"Me and my baby, my baby n me, we're bout as lucky as lucky can be," she gushed. "Watching a wedding in the Caribbean Sea. May Beth and Thomas love forever in clear blue skies and stormy weather! @carafayeearl @realrobertearl @sailorbrinkleycook #luckyhouse #parrotcay."

The 17-year-old beauty is following in her mom's modeling footsteps. She recently graced the pages of Town & Country magazine with her older brother.

But, it seems, she wants to forge their own path. "It can be hard to be up-and-coming and constantly compared to an icon," Sailor told the mag, adding that she's focused on school at the moment.