Kourtney Kardashian didn't care who was around when she decided to go skinny-dipping in Costa Rica — and that was made evident when she shared this sexy photo on her Snapchat, featuring her naked back!

The 37-year-old mother-of-three shared the below snap, where her derriere is clearly on display. She also appeared to have her arms crossed in front of her, so we guess her breasts weren't part of the night's ~show~.

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We can't help but wonder if she was trying to send a message to her on-again, off-again boyfriend, Scott Disick — who In Touch previously reported was disinvited from the trip after partying at Sundance. A source told People he was "in the doghouse" following the incident.

kourtney kardashian snapchat

However, she was joined by her three kids — Mason, Penelope, and Reign — in addition to her other family members Kim and Khloé Kardashian, Kim's two kids, North and Saint West, Kris Jenner and her boyfriend, Corey Gamble, and Kylie Jenner and her boyfriend, Tyga.

“They are all excited about the trip. It will be relaxing for them, but also adventurous with activities like rain forest zip-lining planned. They will be filming for the show the whole time,” said an insider.

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Kanye West was unable to be present for the festivities because of work obligations, and Rob Kardashian and Blac Chyna also missed out — probably because of their ongoing relationship and family drama.

See how much the Kardashians have changed over the years by scrolling through the gallery!