Instagram/Katy Perry & Katie Perry TV Katy Perry loses trademark appeal in Australia. The pop star's legal battle with designer Katie Perry continues over merchandise sales. March 12, 2026 AceShowbiz - Katy Perry has faced a setback in her prolonged trademark conflict with Australian fashion designer Katie Perry, but the dispute remains unresolved. On Wednesday, March 11, Australia's highest court ruled in favor of designer Katie Perry, also known by her married name Katie Taylor, reinstating her trademark rights.