How famous was Katy Perry in 2008?

That's one of the questions Australia's highest court is considering, after hearing arguments in a long-running trademark dispute between the pop star and a fashion designer with almost the same name.

Issues of reputation and timing are at the heart of the stoush, with lawyers for both sides arguing the other's trademark should be ruled invalid.

Designer Katie Perry, who now goes by Katie Taylor, has been locked in litigation with the Firework, Dark Horse and Roar singer since 2019, but the saga goes back much further.

Ms Taylor registered a trade mark in 2007, and says she didn't know of Perry's existence at the time.

But it was a different story when she re-registered a year later, with documents lodged in the High Court showing she'd heard I Kisse

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