Katy Perry: Why She Includes Old Hits like 'I Kissed A Girl' in Her World Tour & TV S
 

Katy Perry thinks it's important for artists to include their old hits at shows. In a recent interview, the "I Kissed A Girl" singer dished on her current world tour, amidst the L.A premiere of her Epix concert TV special, "Katy Perry: The Prismatic World Tour".

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