Kourtney Kardashian is keepin' it real! Despite hers and her family's close relationship with stretch marks, this mother-of-three is winning praise from Instagram commenters for a sexy snap she posted which exposes her upper-thigh stretch marks in a sexy black bathing suit.

The pic is accompanied by a link to a how-to exercise regime for getting rid of your "pooch": "Poosh away your pooch with these 5 simple moves. Link in bio for @amandaeliselee’s step-by-step instructions for each. #pooshthemoves"

So the cool thing is -- Kourtney's got a taught tummy and tight thighs, but there are thin little lines on her hip -- probably from weight gain during childbearing ... THREE times! So commenters immediately recognized that Team Kourtney did NOT alter the photo before posting and they gave her serious love for it, writing, "Thank you so much for not editing out your stretch marks!! 💓👏🏼" and " love when we get to see stretch marks..normal bodies." To which Kourt replied, "I love my little stripes!"

Thanks for being real, Kourt! Us ladies SO appreciate it!