Katy Perry
Self
Shannon Woodward
Self
Rachael Markarian
Self
Glen Ballard
Self
Kesha
Self
Lockhart Brownlie
Self
Brandee Evans
Self
Bryan Gaw
Self
Scott Myrick
Self
Johnny Wujek
Self
Adele
Self
Jessie J
Self
Rihanna
Self
Justin Bieber
Self
Rebecca Black
Self (archive footage)
Alan Carr
Self (archive footage)
Darren Criss
Aaron Christopherson (archive footage)
Ellen DeGeneres
Self (archive footage)
Judy Garland
Dorothy Gale (archive footage)
Whoopi Goldberg
Self
Erica Hill
Self (archive footage)
Lucas Kerr
Self
Heidi Klum
Self (archive footage)
Avril Lavigne
Self
Bonnie McKee
Self
Alanis Morissette
Self (archive footage)
Dermot O'Leary
Self (archive footage)
Britney Spears
Self
Russell Brand
Self
Mia Moretti
Self
Adam Marcello
Self
Casey Hooper
Self
Patrick Matera
Self
Max Hart
Self
Joshua Moreau
Self
Lauren Allison Ball
Self
Tasha Layton
Self
Leah Adler
Self
Anthony Burrell
Self
Lexie Contursi
Self
Ashley Ashida Dixon
Self
Malik Le Nost
Self
Cassidy Noblett
Self
Bradford Cobb
Self
Steven Jensen
Self
Todd Delano
Self
Tamra Natisin
Self
Angela Hudson
Self
Ann Hudson
Self
David Hudson
Self
Keith Hudson
Self
Mary Hudson
Self
Mark Hunter
Self
Angelica Cob-Baehler
Self
Jason Flom
Self
Lauren Christy
Self
Graham Edwards
Self (archive footage)
Baz Halpin
Self
Scott Spock
Self
Chris Wragge
Self (archive footage)
