david letterman raining heels Kim Kardashian  leopard print breasts

We caught up with Kim, Khloe and Kourtney Kardashian as they stopped by the Late Show Tuesday night to chat with David Letterman!

The three were on hand to promote their Sears collection, so all they all sported duds from the line. But talk turned quickly from pants to what's underneath them -- Kim's butt, that is. Dave couldn't stop chatting about the reality star's derriere -- watch the exchange in the video below!

The girls are working it this week -- Wednesday morning they woke up early to head to Good Morning America and The View. And for working it in that leopard dress, Kim had to cover up her much-talked-about psoriasis! See what she used (plus before-and-after pics) after the jump!