We love a matching sister moment

We love a matching sister moment.

Kim Kardashian and Khloe Kardashian in bathing suits during Turks and Caicos vacation

During Khloé Kardashian’s 39th birthday getaway to Turks and Caicos – dubbed “Kamp Koko” – the reality star twinned with Kim Kardashian for a sexy photoshoot in the ocean.

Khloé and Kim, 41, sported matching black string bikinis, with the birthday girl in the “Tiny Ties” top ($49) and bottom ($49) from her Good American brand and the Skims founder wearing her swim label’s triangle top ($32) and dipped tie bottom ($32).

“We are still looking for that damn diamond,” she joked in the caption, referencing a famous scene from a 2011 episode of “Keeping Up With the Kardashians.”

Kim and Khloe Kardashian wearing bikinis during trip to Turks and Caicos3“We are still looking for that damn diamond,” the birthday girl joked in her caption.Instagram/@khloekardashian

At the time, Kim couldn’t stop freaking out after she lost a $75,000 earring in the ocean during a trip to Bora Bora.

The incident occurred after her now ex-husband Kris Humphries pushed her off the dock and into the water.

On her own account, Kim posted a slideshow from their sultry beach shoot, simply captioning it, “Khloé’s Bday Trip.”

The day prior, Khloé shared a pic and video montage of the group's flight on "Kylie Air" to their tropical destination.3Khloé also shared pics and videos from the group’s flight on “Kylie Air.”Instagram/@khloekardashian

The new bikini pics came just one day after Khloé shared pics and videos of pink balloons festooning the entrance to “Kylie Air,” aka a decked-out private jet from sister Kylie Jenner.

“Wheels Up on Kylie Air Kamp KoKo is underway,” she wrote in the caption of the post, which also featured glimpses of her 4-year-old daughter, True Thompson, and brother Rob Kardashian’s 5-year-old daughter, Dream.

Rob, 35, later shared a series of snaps of his daughter having a blast at their tropical destination, captioning it, “Paradise with Dream #KampKoko .”

Rob Kardashian shared adorable snaps of daughter Dream enjoying the tropical paradise.3Rob Kardashian shared sweet snaps of daughter Dream enjoying the tropical paradise.Instagram/@khloekardashian

Noticeably absent from the trip was Khloé’s ex Tristan Thompson, though it appears the NBA star may have sent her pink peonies for her actual birthday on June 27.

Before jetting off for their tropical trip, Khloé’s family threw her a pre-birthday bash at mom Kris’ sleek new home in California. For the occasion, the “Kardashians” star went all in on the Barbiecore trend, sporting a skintight, hot pink PVC minidress for her party.