UK leg of World Tour announced for May 2014.
The US star to headline the opening day of the weekend.
Katy Perry releases her eagerly-awaited third album.
The popstar roared into London to close the iTunes Festival.
John Mayer returns with a laidback melodic offering.
Find out who picked up what at last night’s awards.
Icona Pop and Iggy Azalea confirmed to support.
Which single do you prefer? Roar or Applause? Vote now.
Katy Perry is back with a brand new single.
The first snippet of Roar is revealed in new teaser.
New single teased with new viral video.
Publicity stunt reveals new album details.