Katy Perry announces new world tour

London: Pop star Katy Perry has announced plans to tour world in support of her latest album Prism.

The `Roar` hitmaker will play shows across the globe and took to micro-blogging site Twitter to detail her preparations, reported Digital Spy. "I am going on a world tour!!!Playing all your favorite songs and all the brand new ones!," she tweeted. The 29-year-old`s previous `California Dreams` Tour spanned 124 dates over a year and went on to become one of the highest-grossing tours of 2011. Perry will release `Unconditionally` as the second single from Prism, which topped the charts around the world when it was released last month.