Kourtney Kardashian wishes ‘grandpa’ Corey Gamble a happy 35th birthday!

Corey Gamble may only be 35 years old, but it looks like Kourtney Kardashian’s children refer to him as ‘grandpa’.

The 36-year-old, who’s mum to Mason, five, Penelope, three and 18-month-old Reign with Scott Disick, posted a LOL-worthy post of the music producer with her kids and captioned it, “Happy Birthday @coreygamble! A grandpa never looked so good.”

Corey Gamble with Mason and Penelope Disick. Photo: Instagram

WATCH: Kylie Jenner Gets Tattoo On Her Butt

READ: Kim Kardashian Wants To Be The Last Naked Person To Appear On The Front Cover Of Playboy

Meanwhile, Kourt’s mum Kris Jenner also took to social media to wish her man a happy birthday.

"Happy Birthday to this amazing man @coreygamble!" she wrote alongside a photo of them. "I love you baby I hope you have a magical year!!!!!"

Corey Gamble & Kris Jenner. Photo: Instagram

Kris, 60, and Corey began dating in October last year, but it seems the couple have no plans to marry just yet.

"I don't think love is measured by that piece of paper," Corey told Khloe Kardashian during the season finale of Keeping Up With The Kardashians in Season 10. "Because I know people that are not married that are strong as hell."

PHOTOS: Inside Kris Jenner's 60th Birthday Bash!