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Katy Perry: 'I needed therapy'

5 November 2013 Last updated at 18:05 GMT

Singer Katy Perry told fans she needed therapy last year before she embarked on her latest album, Prism.

The 29-year-old recently became the most popular Twitter user in the world, overtaking Justin Bieber.

Katy spoke to fans and press in Japan as part of her worldwide tour.

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