The US pop star recalls accidentally injuring herself while performing live in Pittsburgh
Online communities helped to hijack the competition
Fundamental Christian group plan to protest singer's gig in Kansas next month
Prince also performed at the Las Vegas bash
Singer-songwriter was given the Lord Of The Rings weapon by director Peter Jackson
Muse, Mumford & Sons and Justin Timberlake are all set to perform
Muse, The Killers and No Doubt perform at the Frankfurt bash
Labrinth scores his first UK Number One single with 'Beneath Your Beautiful', his collaboration with Emeli Sande.
'Love Story' singer earned more than any other celebrity under 30 in the world last year