Pop star Katy Perry called an Australian fashion designer a “dumb bitch” after she sought publicity over their trademark dispute, a court has been told.

In place of the US-based superstar giving evidence in the NSW Federal Court on Wednesday was her manager Steven Jensen from Los Angeles.

Sydney-based designer Katie Jane Taylor – nee Katie Perry – is suing the American singer-songwriter for allegedly infringing on her trademark.

Perry, legally known as Katheryn Elizabeth Hudson, is defending the case and has launched a cross-claim to have Ms Taylor’s trademark cancelled.