In one of the images, the baby boy who was born via surrogate in late July, is held in the arms of his sister, True Thompson, four - the former couple’s daughter.
Big sister True is all smiles as she poses with the infant in their Halloween costumes.
In the second snap, the baby’s leg is zoomed in on with a focus on his mini Nike trainers.
The reality TV star captioned the snaps: “Owlette and Tigger aka True and Baby Brother (Shhhhh…. But I can’t wait for Halloween to be over)."
The-mother-of-two did not show the baby’s face and is yet to reveal his name.
Back in August, the star’s rep confirmed she and NBA star Thompson were expanding their family.
The spokesperson noted, however, that the child was conceived a month before The Kardashians star learnedThompson had cheated on her and secretly fathered another child with another woman.
Thompson has become notorious for cheating on the star on multiple occasions.
He was caught spending the night at a hotel with a mystery bruinette when Khlow was pregnant with True.
He was then caught a year later cheating on her with her sister Kylie’s best sormer best friend Jordyn Woods.
She forgave him on both occassions, but has seemingly ended the relationship for good following the latest betrayal.
However, she has vowed to remain on amicable terms with her ex for the sake of their children.
Thompson, 31, was glimpsed alongside her and their children in a TikTok video from a Kardashian family Halloween party, posted by Kim Kardashian’s daughter North West, nine, this weekend.