The 36-year-old reality star also flaunts her booty in one snap.
Kim Kardashian West and Kylie Jenner have no problem going nude -- with their bikini colors, of course.
Kim took to her app on Thursday to share a few throwback snaps from her family's recent Costa Rica vacation, showing off her and Kylie's matching nude bikinis.
WATCH: Kim Kardashian Shares Sexy Bikini Waterfall Pics From Costa Rica
The sisters casually pose for the camera in front of the gorgeous skyline, while Khloe Kardashian sits poolside in a burgundy one-piece.
In another snap, Khloe is seeing catching some rays while Kim puts her booty on display in the background.
WATCH: Kim and Kourtney Kardashian Show Off Abs at Family Dinner in Costa Rica
The mother of two is clearly a fan of the all-nude look, posting a close-up pic of her suit while she stares at her phone.
WATCH: Kylie Jenner Flaunts Bikini Bod, Snuggles Up to Tyga in Costa Rica
While Kim clearly enjoyed a little R&R on their getaway, she's definitely back to business.
The Selfish author is currently in New York, after supporting husband Kanye West's Yeezy season five fashion show on Wednesday.
"So proud of my baby for his amazing show today! It was so good! I'm so SO proud of him!!! #yeezyseason5," she tweeted after the show.
See more in the video below.