The mum-of-three was praised for her post, with fans commending the Poosh founder for her “refreshing,” no-frills approach to celebrating the natural marks.
“Keeping it real,” one follower commented next to fire emojis.
"Ah the Life / Go Kourt 😁😁...... Skin care very important too lol," said another.
This isn't the first time Kourtney, who is mum to Mason, 9, Penelope, 7, and Reign, 4, who she shares with her ex-husband Scott Disick, has bared her stretch marks.
Back in August, the reality TV star shared another photo to the Poosh official Instagram page of herself rocking a black one-piece bathing suit.
Though the post was promoting simple workout tips to “poosh away your pooch,” the blogger decided to leave her stretch marks unedited.
At the time, her fans championed her as a “proud hot mama” and thanked her for showing everyone “what a natural body looks like.”
She replied to followers telling them: “I love my little stripes.”