Damn! These sisters aren't afraid to unleash their claws on each other...

On the season premiere of Kourtney and Khloe Take Miami this Sunday, the Kardashian siblings duke it out during a photo shoot because Kourt is pissed that Khloe is hungover.

"You f***ing hung over bitch, can't you act professional and get this done for five minutes?" snaps Kourtney. To which Khloe fire back: "I forgot, you're such a mom - you're SO perfect now! You've never been drunk. You used to be the party queen of life, so shut the f*** up, you hypocrite."

Gr, baby, gr! Watch the squabbling go down in the clip above.