ITUNES FESTIVAL: Katy Perry

The pop-licious Ms Perry returns to London for iTunes Festival, performing all her juicy hits: 'I Kissed A Girl', 'Hot ’n’ Cold', 'Firework', 'California Gurls' her new single 'Roar' and more). There'll be costume changes, glitter, confetti and a veritable sugar rush of perky, air-punching pop. Tonight, she's supported by rising Australian rapper Iggy Azalea as well as Icona Pop, the Swedish duo behind the international Number One track 'I Love It'. Win tickets on the iTunes Store, via www.itunesfestival.com.