The exes have a history of being playful in the comments section on one another's posts.
In the three pics, 41-year-old Kourtney shows off her impressive figure in a sparkly, skintight silver bodysuit and black platform heeled boots.
"Take a bow," the reality star captioned the photos.
Playing off Kourtney's caption, 37-year-old Scott cheekily commented, "Bow wow wow yippi yo yippy yay."
The amicable exes have a history of leaving flirty comments on one another's posts. Last month, Scott praised Kourtney, writing in a family photo on Instagram, "Thank you @kourtneykardash for being the best baby maker in town, I couldn’t have asked for a better person in the world to have these amazing children with, I love u and our family more than anything in the world 🌎"
Despite these public displays of affection, the exes are not back together. In fact, Scott rang in the new year with 19-year-old model Amelia Hamlin in Mexico. The pair were spotted hanging out on the beach together.
"Going to Mexico was a nice way for the both of them to unwind, relax and spend more time with each other," a source previously told ET of the trip. "Amelia is easygoing and gets along with Scott's friends, so they're able to just kick back and have a good time."
As for how Kourtney feels about Scott and Amelia's relationship, a source told ET, "Kourtney isn't bothered that Scott is hanging out with Amelia Gray Hamlin and is so far past thinking about him in a romantic way. She knows Scott better than anybody and she is supportive."