Stars (in credits order)
Simon Cowell
Self - Judge
Ryan Seacrest
Self - Host
Randy Jackson
Kimberley Locke
Self - Finalist
Paula Abdul
Clay Aiken
Ruben Studdard
Joshua Gracin
Trenyce
Carmen Rasmusen
Kimberly Caldwell
Rickey Smith
Corey Clark
Julia DeMato
Michael Druck
Self - Contestant
Charles Grigsby
Jeff Dlugolecki
Self
Olivia Newton-John
Self - Guest Judge
Gladys Knight
Lionel Richie
Robin Gibb
Diane Warren
Smokey Robinson
Neil Sedaka
Lamont Dozier
Verdine White
Vanessa Olivarez
Ben Hausbach
Hadas
Rebecca Bond
Jacob John Smalley
Jennifer Fuentes
Candice Coleman
Brian Dunkleman
Self - Host (2006)
Kelly Clarkson
Justin Guarini
Jim Verraros
Nikky D. Williams
Jules Sanchez