Turks and Caicos Islands - Kim Kardashian helped her sister Khloé's birthday with a trip to Turks and Caicos, where the two took full advantage of the Instagram-friendly scenery.

The famous siblings had some tropical fun in the sun while celebrating the Good American owner's 39th birthday.

Kim and Khloé posted various snaps from their Turks and Caicos vacay where the two stunned in match ing black bikinis that left very little to the imagination.

"Khloé’s Bday Trip," Kim captioned the spicy Instagram post of herself posing in the crystal clear water.

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The birthday girl also shared the same post but she took the photo dump as an opportunity to take a little dig at Kim.

"We are still looking for that damn diamond #KampKoko," Khloé wrote, referencing an iconic moment from Keeping Up with the Kardashians.

Fans may remember the KUWTK episode when Kimmy cried over her $75,000 diamond earring after then-boyfriend Kris Humphries playfully tossed it in the water during the Bora Bora trip.

Though the jewelry was eventually recovered, thanks to Kylie Jenner, the painfully funny incident is what led to Kourtney Kardashian's shady deadpan response, "Kim, there's people that are dying."

Rob Kardashian, his daughter Dream, as well as Khloé's daughter True Thompson also joined Kim and KoKo's tropical vacay.

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Khloé shared some snaps of herself in the water with True and her niece.

Following their vacay, the two moms got back on track with their fitness routine and powered through a workout Sunday in Khloé's home Pilates studio. The 38-year-old posted a snap from their session to her IG stories that showed the siblings on their sides while on Pilates reformers, though their session was crashed by their kids.

"This was mine and Kim's Pilates class this morning lol," Khloé wrote over the photo.

"We still got it done though #MomLife."

The 41-year-old reposted the photo, adding "REAL LIFE."

A mom's job is never done, even for the Kardashians!