Kylie Jenner Bares Her Butt in the Tiniest Bikini Ever While Relaxing in the Sand

Kylie Jenner is diving head-first into summertime.

On Thursday, May 15, the Kylie Cosmetics founder shared a series of bikini-clad pictures of her enjoying a beachy trip vacation with her sister Kendall Jenner, 29.

In the photos, Kylie, 27, sported a floral-patterned string bikini as she laid in the sand and posed for a few sexy shots.

“Good morning,” she captioned one of her Instagram Stories posts.

Another post shared on Thursday saw Kylie and her supermodel sister posing for some playful photos at sunset, standing knee-deep in the tropical waters as they hugged and danced.

“she’s my childhood that can never be lost ♾️,” Kylie captioned the heartfelt post.

Yet another Instagram post featured video footage of the two sisters exploring the beach and collecting rocks — after having a few too many cocktails, as Kylie joked in the caption.

“Take a vote down below, rock or coral,” a tipsy Kendall can be heard telling Kylie’s Instagram followers in the lighthearted video, holding up one of their beachfront finds for the camera to see.

The sisters then kiss the rock (or coral) before Kendall throws the rock into the sea as hard as she can, before Kylie jokes: “Oh s—.”

The pair then find a few more rocks which they also chuck into the water before devolving into laughs.

“drunk beach walks with @kendalljenner 😂😂 enjoy,” Kylie captioned the video, tagging her canned cocktail brand Sprinter.

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Just one day prior, the Kardashians star shared some additional stylish bikini photos to her page, including several images of her sporting a metallic gold two-piece bikini — the top of the bikini gathered to form a one-shoulder strap detail that also put her cleavage on display.

Kylie paired the sexy top with a low-rise cheeky bottom, also in the metallic gold shade. In the photos, the 27-year-old hit numerous poses on the beach. She sat in the sand while looking out to the shore, put her toes in the water alongside a friend, laid face down on a towel for a cheeky look at her butt and took a front facing photo with her toned torso front and center.

Her latest bikini is from Cult Gaia. She wore the brand’s Vallie Bikini Top ($218) with the matching Vallie Bikini Bottom ($178).

“Vacation ky activated,” she captioned the set of photos.

The star is taking some time off after a long series of public appearances this year — both solo and with her boyfriend, Timothée Chalamet.

On May 7, they made their red carpet debut in Rome at the 70th David Di Donatello Awards, where the Complete Unknown actor was set to receive the David for Cinematic Excellence honor.

For the outing, the pair, who’ve been romantically linked since 2023, coordinated in chic all-black looks.

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Chalamet, 29, opted for a sleek velvet suit decorated with a boutonniere. The mom of two wore an embossed curve-hugging dress with a plunging neckline, a design from the Schiaparelli Fall/Winter 2025 collection.

She accessorized with a velvet clutch with gold embroidery and statement Schiaparelli earrings. Her hair was style up in a slicked-back bun to show off her bling.

The couple’s big night came just days following Jenner’s appearance at the 2025 Met Gala, which she attended solo in a custom Ferragamo gown.