Paris Hilton was leaving The Nice Guy in L.A. Wednesday night when our photog complimented her on her performance the other night at a bachelorette party in Las Vegas, where she faked an orgasm.

In an entirely separate encounter, we asked Kathy Hilton if she happened to see the video … and it was AWK-ward.

http://www.youtube.com/watch?v=nHx5H02Uvao

Watch Video: tmz.com