Kourtney Kardashian Explodes After Kim Disses Scott

Entertainment Jul. 23, 2010 AT 8:37AM

Kourtney Kardashian is tired of hearing complaints about beau Scott Disick -- and, on Sunday's Kourtney & Khloe Take Miami, she really loses it when sister Kim accuses her of not keeping Disick, 27, on a tighter leash.

Kourtney, 31, is quick to come to Disick's defense.

PHOTOS: The Kardashians as kids!

"Open your eyes," Kim, 29, tells her in the clip (watch above). "Scott is out, taking shots of tequila 'til 4 in the morning when you're at home changing the diapers! We're on your side. We're trying to support you!"

But Kourtney, 31, doesn't want to hear it.

VIDEO: Kim throws a phone at Kourtney

"Go hang out with Khloe and talk sh-t about Scott, you f--king bitches!" she seethes.

The full episode of Kourtney & Khloe Take Miami airs Sunday at 10 p.m./ET. on E!

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