Sister love! In honor of National Siblings Day, Kim Kardashian posted a sultry photo of herself and her eldest sibling, Kourtney Kardashian.

Sister Slaycation

Fans of the KKW Beauty founder know that she has four other siblings, Khloe and Rob Kardashian and Kendall and Kylie Jenner.

The photo appears to have been taken while the duo was vacationing together in Turks and Caicos earlier this week. Along with Kourtney's 24-year-old beau, Younes Bendjima, and her 5-year-old daughter, Penelope Disick, whom she shares with her ex-boyfriend, Scott Disick.

In the new shot, the sisters are wearing black bikini's with matching orange and black visor hats.

"#NationalSiblingDay," the makeup mogul labeled the photo. 

 #NationalSiblingDay A post shared by  Kim Kardashian West (@kimkardashian) on Apr 10, 2018 at 1:32pm PDT

Those who follow the reality stars know that they shared several moments from their lavish trip on their social media accounts.

On Monday, April 9, Kim posted videos of herself as she caught some waves and paddle boarded across the crystal-blue waters in neon bikini.

Kourtney also shared a snapshot of herself on a paddle board as she wore a metallic orange bikini.

The 38-year-old mother of three simply captioned the photo with a sunglasses emoji.

  A post shared by  Kourtney Kardashian (@kourtneykardash) on Apr 9, 2018 at 1:46pm PDT

Along with her various bikini selfies, Kourtney posted a photo of Penelope as she chilled on a beach chair with a book and some fruit. 

The Kardashians Take Tokyo

Kourtney and Kim's trip to Turks and Caicos isn't the first time the sisters vacationed this year. In February, the Keeping Up With the Kardashians star traveled to Tokyo, Japan with one of their younger sisters, Khloe Kardashian. 

The trip was the last adventure for Khloe before she gears up to welcome her first child with her boyfriend, Cleveland Cavaliers player, Tristan Thompson. 

As always the trio showcased several moments from their trip as they traveled throughout the city and enjoyed the culture in Tokyo.