The singer has teamed up with bosses at accessories chain Claire's to design a new line themed around her album Prism.
The pieces will include jewellery, novelty items and collectibles which will all be designed around her song titles and lyrics.
Claire's Inc CEO Jim Fielding says, "Katy aligns perfectly with our brand mission and resonates with our friends and customers around the world."
The Prism collection will launch in May, 2014. Other stars to launch lines through Claire's include One Direction, Bieber and British girl group Little Mix.