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Kourtney Kardashian Talks Boyfriend's Psychotic Behavior, Son's Conception (VIDEO)

06/10/2010 12:22 pm ET | Updated May 25, 2011

Kourtney and Khloe Kardashian visited the Late Show Wednesday night, where they chatted with David Letterman about Kourtney's boyfriend, Scott Disick, who recently got wasted, naked, violent and bloody in Miami.

Kourtney said it just wasn't a good idea to have Scott and Khloe under one roof, so he "got a little crazy." Dave asked how long she's known the guy.

"We've been together for four years, and we broke up for six months," Kourtney said. "We had a little hookup late one night, and it resulted in my beautiful son."

"That's nice, that part's nice, but it seems like he might have a little punk in him," Dave said.

"He has been working on that problem," Kourtney said.

When asked for her input on Scott, Khloe said, "It's the golden rule. If you can't say anything nice, don't say anything at all.

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