David Arquette thinks Rob Kardashian will use his 'great ass' as a 'secret weapon' on 'Dancing with the Stars'

Gina DiFalco
9/1/2011

Arquette also spoke about his estranged wife, Courteney Cox, on 'The Late Show with David Letterman'

Dancing with the Stars contestant David Arquette is checking out a fellow competitor – Rob Kardashian!

Arquette told David Letterman that Kardashian has a “great ass,” just like his famous older sister.

He told the late night show host on Wednesday, "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," Us Magazine reports.

"I'm serious! Once you see it, his ass is fantastic," he continued about Kardashian, 24. "And I really think it's going to be a secret weapon."

Moreover, The Los Angeles Times reports that Letterman pressed Arquette with questions about his estranged wife, former Friends star Courteney Cox.

"I love her with all my heart, but we have compatibility issues. I'm like wild and crazy, she's really calm, and that really sort of started becoming apparent after 11 years. And she thinks I'm moody," he said, adding, "But I'm not moody, Dave!"