The family of 85-year-old Carl Westcott, who was evicted from his $15 million home by Katy Perry, has hit out at the singer ...

Other chart-topping songs from Katy Perry include "E.T. (feat. Snoop Dogg)," "Teenage Dream," "Dark Horse" and "Roar." The U.S. leg of the tour will kick off on May 7 in Houston, Texas.

Catching up with the judges: Lionel, Luke and Katy reveal must-haves ... to sing "California Gurls" (sans Snoop Dogg, unfortunately). All the while, Perry happily chowed down on a slice of pizza.