Kim Kardashian kardash-loc-sml.jpgPhoto credit Ed Graff/One Way Design

The titillating trio is back in Sin City, y'all!

Spotted: Sisters Kim, Kourtney and Khloe at the Pearl Concert Theater at the Palms Casino Resort Friday night (after leaving Kim's party at Palms Place) watching a performance by Usher together. The girls sat up in the skybox with friends.

BTW, we adore their outfits. Hurry back to LA, ladies!