If you're Kourtney and Khloe Kardashian, nothing says sisterly love like a good screaming match.

On Sunday's all-new episode of Kourtney & Khloe Take Miami, the sisters duke it out after Kourtney accuses Khloe of being lazy.

Khloe, on the other hand, sees herself as being useful.

"I'm sitting here playing with Mason, hanging out with Scott, really trying to make an effort here," Khloe, 26, tells her sister. "I've been covering for you at the store while you sit there and work out [and] I'm not complaining! I've offered, let me help you. I'm doing whatever you want to make your life easier." (Watch a clip above)

"Be here and be present and do a good job," Kourtney, 31, fires back. "I didn't want you here to mess everything up."

When Khloe -- who co-owns the DASH boutique with her sister -- argues that she never wanted to come to Miami in the first place because it takes her away from her husband, Lamar Odom, things get ugly.

"Get out of here...we don't want you here," snipes Kourtney. "Run home to Lamar you f***ing crazy b*tch."

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