US singer/songwriter Halsey arrives for the Red Carpet event celebrating 100 episodes of FX’s “American Horror Story” at the Hollywood Forever Cemetary in Los Angeles on October 26, 2019. (Photo by LISA O’CONNOR / AFP) (Photo by LISA O’CONNOR/AFP via Getty Images)

Halsey says that a Katy Perry concert changed her life. Over the weekend, as Perry thanked her fans online, Halsey was one of the first to respond. She wrote: “Katy I saw you stage dive and run around with your parasol at Warped!!! I must have been 13 or 14 years old. That day changed my life! For real!”

Katy Perry is currently celebrating the 15th anniversary of her breakthrough album, One of the Boys.

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