KATY PERRY performed in Nashville on Wednesday night, and something went wrong with her elaborate set-up. She was on her "flying planet stage," when it got stuck . . . keeping her in mid-air. The whole thing is slow and awkward . . . but Katy kept talking to the audience while they found a way to slowly lower the stage to the ground. When it got close enough, she had to jump into the crowd to get off.
(Here's video.)
(By the way, she also brought out "Left Shark" at that show.)