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LOS ANGELES, CA - JUNE 12: Katy Perry performs at the 'Witness World Wide' exclusive YouTube livestream concert on June 12, 2017 in Los Angeles, California. (Photo by Jason LaVeris/FilmMagic)

LOS ANGELES, CA - JUNE 12:  Katy Perry performs at the 'Witness World Wide' exclusive YouTube livestream concert on June 12, 2017 in Los Angeles, California.  (Photo by Jason LaVeris/FilmMagic)