David Hasselhoff as Self

Justin Bieber as K.I.T.T. (voice)

Ken Jeong as Chris

Carlos PenaVega as Pedro

Jon Lovitz as Barry

Rhys Darby as Fish

Flula Borg as Alcee

Will Sasso as Wasserstein

Jim Jefferies as Tommy

Ron Funches as Bill

Dan Bakkedahl as Nick

Master P as Del Toro

Colton Dunn as Redix

Mel B as Self

Michael Winslow as Self

Howie Mandel as Self

Kid Cudi as Self

Irina Voronina as Model

Rick Fox as Self

Gena Lee Nolin as Self

Chelsea O'Toole as Poolside Babe

Spice Williams-Crosby as Mitch Fan

Sarah Colonna as Dina D'Andrea

Jennifer Ikeda as Ann

Victor Turpin as Sebastian

Harry S. Murphy as Mr. Keady

Katy Stoll as Jenn

Datari Turner as Bouncer

Rhian Paige as Baywatch Babe (uncredited)

Roxanne Gregory as Blossom Tate