Kim Kardashian posts sexy throwback photos from Costa Rica family vacation

Kim just made #ThrowbackThursday even more memorable.

The 36-year-old reality star posted a slew of risque photos from her family's recent Costa Rica trip -- and they're hot, hot, hot!

Mrs. Kardashian-West shared a number of pics with her sisters, Kylie and Khloe. In one photo, the sisters are casually hanging out by a pool with a gorgeous oceanside view in the background. Kim and Kylie rocked matching nude bikinis, while Khloe appeared in a burgundy one-piece.

In another photo, Khloe is casually laying out and catching some rays while Kim gives the camera an eyeful with her jaw-dropping booty.

The mother-of-two clearly made the afternoon pool session a full-on photoshoot, showing off another snapshot of her laying out in the same nude two-piece while looking at her phone.

The Kardashian sisters made Costa Rica their very own New York Fashion Week, stepping out in numerous sexy styles that we're sure their adoring fans will replicate soon enough!

Speaking of NYFW, the Kardashians were seen all over New York City this past week. Kendall walked in numerous fashion shows, including La Perla, where she gave the audience an eyeful with a sheer dress that gave a good view of her backside.

Meanwhile, Kylie went on a posting spree on social media, sharing behind-the-scenes pics from her first-ever NYFW pop-up shop and her super romantic Valentine's Day with beau Tyga.