Katy peels off and slips on a banana for MTV

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She changed dresses 13 times at the celebrations in Liverpool. Coming off stage she said: "I'm still breathing heavily because of the 12 costume changes - I'll have the 13th for the afterparty."

Girl power: Katy's 13 costumes included a pink romper suit emblazoned with her name and dress in the shape of a carousel

Her costumes overshadowed bigger names at the event, who included Beyoncé, Pink and Leona Lewis.

Perry, 23, started dressed as an American footballer as she performed her hit I Kissed A Girl. She sang another song from the middle of a giant banana.

Banananarama: Katy sings when sitting in a giant banana

But a dress printed with Barack Obama's face tapped into the theme of the night, with mention of the US president-elect generating the loudest cheers among the audience of 10,000. Sir Paul McCartney, who was presented with the Ultimate Legend award, thanked everyone who voted for Mr Obama.