Lady Gaga

Self

Elton John

Self

Joseph Gordon-Levitt

Self

Kristen Bell

Self

RuPaul

Self

Steve Whitmire

Kermit the Frog / Beaker / Rizzo the Rat / Statler / Lips (voice)

Eric Jacobson

Miss Piggy, Fozzie Bear, Animal, Sam the Eagle (voice)

Dave Goelz

The Great Gonzo, Dr. Bunsen Honeydew, Waldorf, Zoot (voice)