Mark Hamill
Self
Brad Garrett
Self
Martin Short
Self
Jason Alexander
Self - Performer
William Shatner
Self
Stanley Tucci
Self
Mary Steenburgen
Self
Rob Reiner
Self
Cedric the Entertainer
Self
Julie Andrews
Self
Jane Seymour
Self
John Lithgow
Self
Ted Danson
Self
Mel Brooks
Self
Carol Burnett
Self
Tony Hawk
Self
Jenny McCarthy-Wahlberg
Self
Judd Apatow
Self
Stephen Colbert
Self
Dick Van Dyke
Self
Craig Robinson
Self
'Weird Al' Yankovic
Self - Performer
Skylar Astin
Self - Performer
Ken Jeong
Self
Tichina Arnold
Self - Performer
Rufus Wainwright
Self - Performer
Roma Downey
Self
David Copperfield
Self
Amber Riley
Self - Performer
Darren Criss
Self
Harry Shum Jr.
Self
Beth Behrs
Self - Performer
Derek Hough
Self
Rita Ora
Self - Performer
Lin-Manuel Miranda
Self
David Archuleta
Self
JoJo Siwa
Self - Performer
Amanda Kloots
Self - Performer