Katy Perry lost a court battle against fashion designer Katie Perry (Picture: Getty)

Katy Perry has lost a court case battle against Katie Perry, after a legal battle over their names.

Australian fashion designer Katie Taylor started selling clothes under her birth name, Katie Perry, in 2007, and filed a trademark in her home country the following year.

She accused the Dark Horse singer, 38, of ignoring her trademark several times to sell merchandise in the country during tours in 2014 and 2018.

According to BBC, the American Idol judge – real name Katheryn Hudson – was alleged to have promoted products including hoodies, scarves and other closing on social media amid her Prismatic performances.

On Friday, a judge ruled in the designer’s favor, agreeing that items the American Idol judge sold did in fact breach the trademark – but rejected other claims relating to merch from her 2018 tour.

Justice Brigitte Markovic said: ‘This is a tale of two women, two teenage dreams and one name.’

Katie spoke of the decision in a post on her personal website (Picture: Facebook)

She dismissed an attempt by Katy to cancel the existing trademark, and ruled that her Kitty Purry company must pay damages, which will be decided in a hearing next month.

However, she added that the Grammy-winner used the name in ‘good faith’, and will not owe personal compensation.

Following the decision, Katie – who initially filed the case in 2019 – described the ruling as ‘David v Goliath’ in a post on her personal blog,

‘Instead of giving in, I decided to fight against this injustice. I established my fashion label for loungewear that focuses on sustainability and local production. I was really busy working hard to establish my brand. You could say I was a real Aussie battler,’ she penned.

The singer’s company will have to pay damages (Picture: Getty)

‘Over the past few years, including whilst battling it out in court, I have been bullied and trolled. My friends and family have been trolled. 

I have had to bear hearing disparaging comments being made about me as I sat in court with tears in my eyes.

‘I have been told I am naive and an opportunist – but they are simply traits of entrepreneurs trying to get a start up business off the ground.

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This is a win for small business. We matter, Australian laws matter and most importantly in the face of a bully it is important to stand up for yourself. 

‘My two young children have witnessed the importance of standing up for their values no matter how hard it is.

‘Not only have I fought myself, but I fought for small businesses in this country, many of them started by women, who can find themselves up against overseas entities who have much more financial power than we do.  WE DID IT – WE HAVE WON.’

Metro.co.uk has contacted Katy’s reps for a comment.

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A judge ruled in Katie’s favor.