Kathy Griffin and Russell Brand out-filth each other in a hilarious preview for her Bravo TV talk show, and RadarOnline.com has the outrageous clip!

The dirty-mouthed comedians can be seen dropping crude words, with Russell, 37, screaming “w****r” and Kathy, 52, dropping the C-bomb!

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The pair then get into some serious sex talk when Kathy tells Russell: “You’re going to be sore when I’ve finished with you,” to which Russell replies he’s built with a special “lubricant,” – how charming!

Also joining the controversial host and British funnyman on this week’s Valentine’s Day live show are rap superstars A$AP Rocky and Danny Brown.

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To catch all the rude goings-on tune into Kathy on Thursday February 14 at 10p.m. ET/PT on Bravo.