By Kelsey Glein
Updated Apr 20, 2016 @ 12:15 pm
Frederick M. Brown/Getty Images

Kourtney Kardashian's birthday celebrations in Iceland continue. The Keeping Up with the Kardashians star took to Instagram yesterday to share several more photos from her fun-filled getaway, and from the looks of it the mother of three is having the best time ever.

The brunette beauty posted several snaps taken during a late night swim session with her friends Simon Huck, Stephanie Sheppard, and Nicole Reda, and in one of the pictures Kardashian bares it all. Wearing a black long-sleeve one-piece swimsuit that features a zipper up the front and cut-out sides, she poses for the camera while sticking out her toned derriere. "Eski-ho," she cheekily captioned the 'gram.

Check out more photos from their night swim below.