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