The reality TV star, 36, has shared some rare selfies with her youngest son Reign - and can be seen beaming from ear to ear.
Kourtney, currently separated from the father of her three children Scott Disick, looks happy and serene in new snaps with her eight-month-old son.
Seen relaxing at their LA home, Kourtney chose to share some pictures with her son, whom she's endeavoured to keep out of the public eye - despite being in one of the most famous families on earth.
"Smiling" and "serious", she captioned the two pictures.
Fans were quick to comment, with one admirer writing: "You look amazing!!! What's your secret?"
Another said: "The most real Kardashian of the three sisters. Keep on being 100% real."
In the photos, cutie Reign looks the spitting image of his older brother Mason... And lots like his daddy.
Kourtney and Scott separated after nine years, following Scott's increased partying and a rumoured flirtation with an ex-girlfriend.
They have not been seen together since their split last month, although he has been catching up with his children Mason, five, Penelope, three, and Reign.
Keeping Up With The Kardashians star Kourtney has just returned from a family holiday in St Barts.
A friend of the couple recently told the US magazine People that the split may not be permanent, saying. "I still could see them getting back together."
All you need to know about Kourtney Kardashian:
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