Broadway veteran and all-around “theater enthusiast” Joan Rivers made a very special trip "Down Under" with her grandson, Cooper Endicott, when the duo stopped by Priscilla Queen of the Desert. While filming for Rivers' reality show Joan & Melissa: Joan Knows Best?, the pair headed to the Palace Theatre for a special backstage tour. Rivers, who is an investor in the show, chatted with her friend and Priscilla star Tony Sheldon about divas like Judy, Liza and Lauren Bacall (who all once inhabited Sheldon’s dressing room). Rivers however became quite nervous when she lost Cooper backstage in the maze of the show's eccentric wardrobe department. Click below to watch Rivers’ run wild through a hall of drag queens as she tries to find her grandson!