Katy Perry - If Lady GaGa is the number one pop diva then Katy Perry isn't far behind her. Taking the Alanis Morrissette/ Avril Lavigne blue print and injecting it with a healthy dose of fun Perry will no doubt bring colour to the stage. With hits like 'Waking Up In Vegas' and 'Hot 'n' Cold' in her set you know this will be a good party, be sure to throw the cherry chap sticks during 'I Kissed A Girl'.
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