Kim Kardashian tweeted on Monday that Kourtney's party included skinny dipping, "special" brownies and nipple clamps.
It seems Kourtney Kardashian's wild night has finally caught up with her.
The 38-year-old reality star took to Instagram on Tuesday to share a pic of her mid-day "siesta" -- which included Kourtney's taned, toned bod and a hint of underboob.
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The mother of three and her gal pals definitely deserve a little R&R after their crazy birthday festivities in Tulum, Mexico, which according to Kourtney's sister, Kim, included skinny dipping, "special" brownies, nipple clamps, twerking, naked cartwheels, a giant inflatable penis and Kourtney throwing up "in her bed four times."
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WATCH: Kourtney Kardashian Celebrates Turning 38 in Her 'Birthday Suit' -- See the NSFW Pool Pic!
See more on the eventful vacay in the video below.