The rapper recorded his track for last year's 'The Blueprint 3' album as a homage to New York, and now Katy has penned her own tribute to California.
Speaking about her song, 'Californian Girl', Katy said: "It's so great that 'Empire State of Mind' is huge and that everyone has the New York song, but what the f**k? What about LA? What about California?
"It's been a minute since we had a California song and especially from a girl's perspective," 'Waking Up In Vegas' singer Perry told Rolling Stone magazine.
"We took the references of Prince, which is always a great reference, and some of the '90s, almost house music references," she explained.
