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

The X Factor UK 2012 Ella Henderson sings Youve Got the Love

Katy Perry - The One That Got Away (Live X Factor)

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

Ella Henderson sings Take Thats Rule The World Live Show 1 The X Factor UK 2012

The X Factor UK 2013 The Final 5 sing Burn by Ellie Goulding Live Week 8

Katy Perry - Firework - The X Factor Results Show 2

Ella Hendersons performance Jason Mrazs I Wont Give Up The X Factor UK 2012

Katy Perry - Firework

Katy Perry sings Yesterday

The X Factor UK 2012 Union J sing for survival Set Fire To The Rain by Adele Live Week 6

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

Katy Perry - Firework in Live At Logies Awards 2011

Katy Perry Firework

Katy Perry chante son tube "Teenage Dream" en live

The X Factor UK 2012 Jahmene Douglas performing Listen by Beyonce Live Week 5

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

The X Factor UK 2014 Paul Akister sings Ella Hendersons Ghost Live Week 1

The X Factor UK 2013 Hannah Barrett sings Skyfall by Adele Live Week 3

The X Factor UK 2014 Andrea Faustini sings Ella Fitzgeralds Summertime Live Week 6

Katy Perry performs Live ROAR on Saturday Night Live 10122013

The X Factor UK 2014 Jay James sings Eric Claptons Tears In Heaven Sing Off Live Week 5

Katy Perry - Shooting GQ US

Katy Perry - The One That Got Away (Radio Edit)

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

Katy Perry Firework Performance USNA