The couple are currently expecting their second child and Jenner used an appearance on Bethenny, due to air today (June 25), to insist that they are "so together".
"They're always together," Us Weekly quotes her as saying. "They have always been together. They're very, very happy."
Jenner added that her daughter is "the one who really doesn't want to get married", following Kourtney's admission that she considers the institution "claustrophobic".
"But they're really cute," Jenner added. "When Kourtney's out of town, he's at my house every night for dinner. I'm like, 'He's never going to go home!'"
Kourtney's sister Khloe recently said that Disick is "so much better now", adding: "He has worked hard and fights his demons. Plus, he is a great dad and good to Kourtney."