David Arquette knows how to hype up the buzz for the upcoming season of Dancing with the Stars. The best way ... to compare his fellow DWTS contestant Rob Kardashian's butt to Kim Kardashian's famous rear.

While appearing on The Late Show With David Letterman, Arquette told Dave:

    "The thing about Rob is, and a lot of people don't know this, but he's got a great ass just like his sister. I'm serious! Once you see it, his a** is fantastic. And I really think it's going to be a secret weapon."


As for his dance style, Arquette adds, "When I dance, I look like I'm being electrocuted. Apparently there's no real room for that in ballroom dancing."

Arquette has been paired up with professional dancer Kym Johnson.