Kim Kardashian Throws a Phone at Kourtney

Entertainment Jul. 16, 2010 AT 2:57PM

Move over, Naomi Campbell.

On Sunday's Kourtney and Khloe Take Miami, Kim Kardashian pays a visit to her sibs, but Kourtney gets irked because Kim, 29, is constantly on her phone.

"Kim is like a crack addict when it comes to her BlackBerry!" Kourtney, 31, complains in the clip (above). "If it's not in her hand, she literally starts twitching."

PHOTOS: Kim's TMI TwitPics

Kourtney ends up hiding Kim's phone -- and when Kim learns that she won't be getting a new one, she calls her sib the b-word and hurls Kourtney's phone at her.

PHOTOS: Kardashian family album

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

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