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The X Factor UK 2013 The Final 11 sing Roar by Katy Perry Live Final Week 10

The X Factor UK 2012 Ella Henderson performing Firework by Katy Perry Live Week 5

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Katy Perry - The One That Got Away (Audio) 2011

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The X Factor UK 2013 Shelley Smith sings Natural Woman by Aretha Franklin Room Auditions Week 2

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Katy Perry chante son tube "Teenage Dream" en live

Katy Perry - Tucked (The Smile Video Series)

The X Factor UK 2012 The Finalists sing Carly Rae JepsenOwl Citys Good Times

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The X Factor UK 2013 Colin Stacey sings Someone Like You by Adele Room Auditions Week 2

The X Factor UK 2014 Lauren Platt sings Katy Perrys Dark Horse Live Week 4