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Overview: Global mega-star Katy Perry performs exclusively for ITV in a night full of spectacular performances from her incredible back catalogue and new album.

Cast:

Katy Perry
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Orlando Bloom
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Tom Grennan
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AJ Odudu
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Brian May
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Olivia Attwood
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Jordan North
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Alex Scott
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Gemma Collins
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Lenny Rush
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Kate Garraway
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Jess Glynne
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Isla Fisher
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Kelly Holmes
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Clare Balding
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Ashley Roberts
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Ellie Simmonds
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Alice Arnold
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John Grimes
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Edward Grimes
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Sian Welby
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Richie Anderson
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Sam Darlaston
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Tyler West
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Tiwa Savage
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Renee Mellor
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Will Mellor
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Michelle McSween
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Georgia Wood
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Jack Remmington
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Tatum Mcgreal
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Luis Elkes
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Daniel Brocklebank
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Salvatore Torrisi