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Kim, Kourtney and Khloe Kardashian appeared on “Late Show with David Letterman” last night to promote their new Sears clothing line. Letterman showed Kim’s infamous butt X-ray, and Khloe jumped in and explained why Kim’s a** is so big.

Check out the conversation in the video below!

Kim Kardashian Gets Butt X-Ray To Prove She Doesn’t Have Implants

Rob Kardashian Goes In On Sister, Kim Kardashian: “You’re A Whore”

Which Kardashian Sister Is The Baddest Of Them All?