Kourtney Kardashian Rocks Super Sexy Tiny Bikini on Mexico Vacation With Scott Disick -- See the Pic!

The 37-year-old reality star is looking amazing!

Kourtney Kardashian is looking amazing!

The 37-year-old reality star showed off her fit physique in a super tiny bikini while spending a romantic weekend in Mexico with her healthy-looking on-again, off-again beau, Scott Disick, 33.


WATCH: Scott Disick Shares Sexy Photo of Kourtney Kardashian's Butt During Mexico Vacation

An eyewitness tells ET that the couple looked closer than ever as rumors have been swirling that Scott has been trying to turn his life around for the mother of his children.

And speaking of kids, the two were with their little ones -- Mason, 6, Penelope, 4, and Reign, 1 -- for part of the trip.

WATCH: Scott Disick Posts Family Photo With Kourtney Kardashian, Calls Khloe Kardashian Friendship ‘Relationship Goals'

Kourtney posted a mother-daughter pic to Snapchat over the weekend of her and her daughter taking in the "Mexico vibes."

Meanwhile, Scott and Kourtney have taken kindly to their time in paradise.

On Sunday, Scott shared a photo of Kourtney in the pool at sunset, while he checked out the "Views" of her bikini booty.

Shortly after, Kourtney posted a similar photo of her own.

WATCH: Scott Disick Fears He'll Return to Old Ways While Kourtney Kardashian and Kids Are Out of Town