Katie Perry initially won when she sued the singer for trademark infringement in 2023 – but the ruling was overturned on appeal in 2024.

Australia’s High Court has now sided with the less famous Perry, who has since changed her name to Katie Taylor.

In a 3-2 decision, judges said businesses associated with the singer had been “assiduous infringers” of the designer’s trademark.

In a statement, Ms Taylor said: “This case has never just been about a name.

“It has been about protecting small business in Australia, for standing up for what is right and showing that we all matter.”