David Walliams / Self
Trinny Woodall / Self

Geri Horner / Geri Doll
Amanda Holden / Self
Gary Lineker / The Penguin
Richard Madeley / Self
Colin McAllister / Self /  Ugly Sister
Piers Morgan / Self
Cliff Richard / Self
Justin Ryan / Self /  Ugly Sister
Frankie Bridge / Self (as The Saturdays)
Una Healy / Self (as The Saturdays)
Rochelle Humes / Self (as The Saturdays)
Mollie King / Self (as The Saturdays)
Vanessa White / Self (as The Saturdays)
Robbie Williams / Self - Performer /  Prince Charming
Rachel Adedeji / Self (as X Factor Finalists)
Graziella Affinita / Self (as X Factor Finalists)
Shaniece Davis / Self (as X Factor Finalists)
Edward Grimes / Self (as X Factor Finalists)
John Grimes / Self (as X Factor Finalists)
Rikki Loney / Self (as X Factor Finalists)
Paul Allison / Choir
Newley Aucutt / Choir
Joseph Claus / Choir
Chris Theo Cook / Choir
Robert Dowton / Choir
Ben David Mann / Choir
Barry McGonagle / Choir
Callum McIntosh / Choir
James Meunier / Choir
James Smoker / Choir
Michael Storrs / Choir
Matthew Taylor / Choir
Noddy Holder / Self - Announcer (voice)
Miss Frank / Themselves
Jedward / Themselves (as John & Edward)
Gareth Jones / Father Christmas
The Stig / Cameo on Top Gear toy packaging (uncredited)