Katy Perry's merchandise company are suing counterfeitters.

Bravado International - which licenses the exclusive rights to sell t-shirt, hats, posters and other products from a variety of artists, including the Red Hot Chili Peppers, Rolling Stones and Led Zeppelin - have filed court documents against fraudsters who sell illegal merchandise outside the 'Roar' hitmaker's concert in a bid to get them to stop.

According to website TMZ, the company have asked a judge to call a halt to the counterfeit sales and confiscate any unofficial merchandise sold near her shows.

This isn't the first time Bravado International have attempted to stop fraudsters selling fake merchandise.

In 2009, they filed a lawsuit against Dollar Days International, arguing they were illegally using the names and likenesses of stars including Michael Jackson and Jim Morrison in the sale of products including watches, shirts and play money.

In that case, the company sought $2 million for each violation of their rights.

Katy is currently involved in another legal battle as she is being sued by Christian hip-hop star Flame - real name Marcus T. Gray - and three other musicians who have accused her of ripping off their award-winning Christian gospel track 'Joyful Noise' for her hit song 'Dark Horse.'

The 32-year-old rapper claims in court documents that 29-year-old Katy, whose parents are pastors, hijacked their music, tarnished it with black magic, witchcraft and paganism, and ruined their reputation in the Christian music world because of the imagery that appears in her music video.

The group, who released their track five years ago, are seeking unspecified damages and want the 'I Kissed a Girl' singer, who is currently on her 'Prismatic World Tour' to be banned from using any form of their music immediately.

The star co-wrote the track with singer-songwriter Sarah Hudson in her native Santa Barbara, California, and previously claimed it was inspired by the 1996 film 'The Craft' for the song, which is ''about warning a guy that if you're going to fall in love with me, make sure you're sure because if not, it's gonna be your last.''