"Sun vibes," she wrote as a simple caption to the revealing image.
Kourtney, of course, also included with this message and picture a link to Kardashian Sun Kissed tanning products on Twitter.
In the past, we've speculated that Kourtney purposely would share intimate pictures in order to rub her hot body in the face of ex-boyfriend Scott Disick.
But it now seems very unlikely that Kardashian and Disick will ever get back together.
Instead, it seems as if the Keeping Up With the Kardashians star just wanted to remain in shape.
She has been working out almost daily with her personal trainer Don, and sharing images from workouts on Snapchat.
It is beach season, after all, and while members of this family love to talk about getting their bikinis bodies "back," do you know what's far easier?
Just keeping those bodies intact all year round!