In one of the pics, Ratajkowski stands near the water, rocking a cheeky one-piece swimsuit. "25," she captioned the snap.
The London-born babe flaunted her front side, too. She looked seemingly flawless while taking a dip in the ocean, sporting an oversized hat and an eye-popping black string bikini.
She also gave her 6.5 million followers a peek at her gorgeous view, posing on a rock in an emerald green Tori Praver two-piece at the luxurious Amanyara Resort in the Caribbean Island of Providenciales, Turks and Caicos.
Back in February, ET caught up with Ratajkowski, where she explained why she has no shame in posting risqué pics via social media.
"I think that as a woman, it's important to celebrate your sexuality and your beauty, and claim it as your own -- just as it's as important to speak politically," the Gone Girl actress revealed. "I think it all goes hand-in-hand."
She also gave us some insight on how she keeps her backside in tip-top shape.
"Honestly, first of all, my mom has a similar butt to me -- I got lucky in that department," she said. "But for me, that's also the part that if I gain weight, that's where it goes. Honestly, hikes and walking -- uphill hikes -- that's the way I feel that step burn the most."