The duo have previously had a difficult relationship as Kardashian questioned whether Disick was good enough for her sister Kourtney Kardashian.
However, Kardashian told Aventura that Disick - who has a 2-year-old son with Kourtney and is expecting a daughter - has changed recently.
"Scott is so much better now," she said. "He has worked hard and fights his demons. Plus, he is a great dad and good to Kourtney."
Kardashian added: "I never thought I would be saying something like this, even a year ago. But I give credit where credit is due."
Kardashian recently revealed that Disick is "nervous" about having a daughter, saying that he will be "protective".