Katy Perry as Self

Shannon Woodward as Self

Rachael Markarian as Self

Mia Moretti as Self

Glen Ballard as Self

Adam Marcello as Self

Casey Hooper as Self

Patrick Matera as Self

Max Hart as Self

Kesha as Self

Joshua Moreau as Self

Lauren Allison Ball as Self

Tasha Layton as Self

Leah Adler as Self

Lockhart Brownlie as Self

Anthony Burrell as Self

Lexie Contursi as Self

Ashley Ashida Dixon as Self

Brandee Evans as Self

Bryan Gaw as Self

Malik Le Nost as Self

Scott Myrick as Self

Cassidy Noblett as Self

Bradford Cobb as Self

Johnny Wujek as Self

Steven Jensen as Self

Todd Delano as Self

Tamra Natisin as Self

Angela Hudson as Self

Ann Hudson as Self

David Hudson as Self

Keith Hudson as Self

Mary Hudson as Self

Mark Hunter as Self

Angelica Cob-Baehler as Self

Jason Flom as Self

Adele as Self

Jessie J as Self

Rihanna as Self

Justin Bieber as Self

Rebecca Black as Self (archive footage)

Alan Carr as Self (archive footage)

Lauren Christy as Self

Darren Criss as Aaron Christopherson (archive footage)

Ellen DeGeneres as Self (archive footage)

Graham Edwards as Self (archive footage)

Whoopi Goldberg as Self

Baz Halpin as Self

Erica Hill as Self (archive footage)

Lucas Kerr as Self

Heidi Klum as Self (archive footage)

Avril Lavigne as Self

Bonnie McKee as Self

Alanis Morissette as Self (archive footage)

Dermot O'Leary as Self (archive footage)

Britney Spears as Self

Scott Spock as Self

Chris Wragge as Self (archive footage)

Russell Brand as Self