The Keeping Up With The Kardashians star enjoyed a nine-year on/again off/again relationship with entrepreneur Scott Disick, 35.
Kourtney Kardashian, 39, shares three children with Scott – Mason, eight, Penelope, six, and Reign, three.
Since their split in 2015, both Kourtney and Scott have moved on romantically – seeing Scott in a relationship with model Sofia Richie, 20, and Kourtney enjoying romances with models Younes Bendjima 25, and Luka Sabbat, 21.
Scott and Kourtey’s difficulty in maintaining a friendship while co-parenting as exes was played out on the family’s hit reality show.
But in recent times, it seems the pair are now firmly on good terms once more.
This was proven in their latest joint snap.
The pair sat on a bed with only daughter Penelope for the sweet family pic.
Scott sat his adorable little one on his lap, as they both played with his phone.
Kourtney meanwhile smouldered down-the-lens, as she posed in a racy cut-out frock.
Seemingly unaware of the adorable family moment going on behind her, Kourtney rested her arm behind her head and pouted at the camera in true Kardashian-style.
She jokingly captioned the shot: “Co-parenting.”
But while some of her following found the cheeky display “hilarious” and thought Kourtney looked “sexy”, other Instagram users accused Kourtney of being “desperate”.
One follower wrote: “Wow, petty, what about Sofia?”
While another continued: “What’s the point? To tease him.”
A third simply damningly said: “Desperate.”
It looked to be a fun family day for all, as Scott also shared a cute-as-a-button photo of youngest song Reign, covered in jam, as he tucked into a rather delicious-looking doughnut.