Kylie is currently dating Chyna's former fiance Tyga, with whom she has three-year-old son King Cairo.
But Rob is now thrilled that they have decided to bury the hatchet and become friends, reports femalefirst.co.uk.
He took to Instagram to upload an image of the former arch-enemies posing for a photograph together.
"So happy my girls finally got to talk and make peace! My family. All love,� he captioned the image.(IANS)