Rob Kardashian is absolutely in love with his nephew.

The 24-year-old reality star is very fond of his sister Kourtney's two-year-old son Mason.

Rob endeavours to spend as much time with Mason as possible.

"He loves me," Rob told OK! magazine. "He always calls me Bob, and I always go and see him. I love him to death, he's the cutest kid."

Rob enjoys seeing his kin gradually mature. Everything about Mason's development interests him.

"I swear I'm not being biased. I'm so in love with that kid, but it's so cool just to see him grow up," Rob explained. "[To] see his hair grow from last year, pretty much no hair and now he has hair to his shoulders it's fun watching a child grow up especially if he's in your family."

Kourtney and her partner Scott Disick announced in November that they were expecting their second child together.

Rob is elated to become an uncle for the second time.

"I'm super excited, super excited," he said.

"I hope it's a boy! Because there's been so many girls in our family. I feel like it's going to be a boy but everyone else feels like it's going to be a girl. But I think it would be kind of cool to have two brothers at close age because they'd be two years apart. We're so close, regardless they're going to be close. I'm close with all my sisters, obviously, but it should be a very good situation for our family."