AceShowbiz -

Kourtney Kardashian's kids have apparently gotten so close with Kris Jenner's boyfriend Corey Gamble. As he turned 35 on November 10, the mother of three took to Instagram to wish him a happy birthday.

Kourtney posted a picture of Corey sandwiched by two of her kids, Penelope, 3, and Mason, 5, who were all sitting on a couch. She captioned it, "Happy Birthday @coreygamble ! A grandpa never looked so good."

Happy Birthday @coreygamble ! A grandpa never looked so good. ���������������

A photo posted by Kourtney Kardashian (@kourtneykardash) on Nov 10, 2015 at 8:59am PST

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Kris took to her own Instagram to congratulate her boy toy Corey on his birthday. "Happy Birthday to this amazing man @coreygamble ! I love you baby I hope you have a magical year!!!!!" so she wrote.

When Kris was still married to Caitlyn Jenner (previously Bruce Jenner) and before her transition into a woman, she's practically a grandfather to Kourtney's children. After she made her debut as a woman, Caitlyn's kids, Kylie Jenner and Kendall Jenner, still call her "father," but it's unclear how Kourtney's children address Caitlyn.