As two of the biggest pop stars in the world both return with new singles in one week, join Capital as we compare and contrast the unstoppable pop heavyweights that are... Katy Perry and Lady Gaga!
Katy Perry To Close iTunes Festival 2013
The 'I Kissed A Girl' singer is the latest name added to the line-up for this year's month-long event in London.
The 'Firework' singer will close the event on Monday 30th September as she prepares for the release of new album 'Prism'.
The singer's third record will be released on 22nd October, with new single 'Roar' available to download from 8th September.
Other stars already confirmed to perform at this year's iTunes Festival include opening act Lady Gaga, Justin Timberlake and Jessie J.
Dizzee Rascal, Lawson, Rizzle Kicks, Paramore, Arctic Monkeys and Tinie Tempah will also be performing during the month-long series of gigs.
The iTunes Festival takes place throughout September at the Roundhouse in Camden, London.