A court in Australia ruled that musical superstar Katy Perry infringed the trademark of a Sydney-based fashion designer who sold her products under the label "Katie Perry."

Katie Taylor, who filed the lawsuit in 2019, claimed the singer disregarded the trademark and sold Katy Perry clothing to Australian customers via retailers and websites during her concert performances in the country in 2014 and 2018.

Federal court judge Brigitte Markovic declared on Thursday that Katy Perry's company, Kitty Purry, partially infringed the trademark of online clothing retailer Katie Taylor's business by promoting the singer's products through social media posts.

Damages will be determined at a later date.

"This is a tale of two women, two teenage dreams, and one name," Markovic remarked in her verdict.

The judge denied the pop star's request to revoke Katie Perry's trademark.

Taylor, whose name is Katie Perry, referred to the verdict as a "David and Goliath" victory for small businesses.

In a blog post, she stated, "Not only have I fought for myself, but I have also fought for small businesses in this country, many of which were founded by women, who can find themselves competing with foreign entities that have much more financial power than we do."

Katy Perry's representatives were not immediately reachable.

In 2008, Taylor registered the "Katie Perry" trademark in Australia, igniting the dispute between the pop star and the Australian fashion designer over the name.

Katy Perry initially attempted to block the registration and subsequently hired attorneys to force the designer to cease and desist using the mark, but ultimately abandoned the effort, according to Taylor.