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ST. PAUL, MN JULY26: Katy Perry and Gene Simmons on the red carpet at the 2015 Starkey Hearing Foundation So The World May Hear Gala at the St. Paul RiverCentre on July 26, 2015 in St. Paul, Minnesota.(Photo by: Adam Bettcher/Getty Images for the Starkey Hearing Foundation)

ST. PAUL, MN JULY26: Katy Perry and Gene Simmons on the red carpet at the 2015 Starkey Hearing Foundation So The World May Hear Gala at the St. Paul RiverCentre on July 26, 2015 in St. Paul, Minnesota.(Photo by: Adam Bettcher/Getty Images for the Starkey Hearing Foundation)