Kourtney Kardashian Takes a 'Siesta' in a Bikini After Wild Birthday Festivities

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.

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."

See more on the eventful vacay in the video below.