Kourtney K looks good coming and going!

The 39-year-old mother-of-three showed off her impressive abs and derriere in skin-tight, high-waisted yoga pants and a graphic colorblock crop top sweatshirt. Kardashian has been spending lots of time with her female friends and her kids since she finished a string of romantic vacays with boyfriend Younes Bendjima. Now it's baby daddy Scott Disick's turn to travel -- he's off cavorting with his teenage girlfriend Sofia Richie AND THE KIDS! in St. Barth -- stay tuned for those pix coming up!