Jason Lee character Dave
David Cross character Ian
Cameron Richardson character Claire
Jane Lynch character Gail
Justin Long character Alvin (voice)
Matthew Gray Gubler character Simon (voice)
Jesse McCartney character Theodore (voice)
Veronica Alicino character Amy
Allison Karman character Female Intern #1
Tiara Parker character Female Intern #2
Kira Verrastro character Female Intern #3
Beth Riesgraf character Mother in Store
Adriane Lenox character Vet
Don Tiffany character Engineer
Frank Maharajh character Barry
Kevin Symons character Ted
Jayden Lund character Security Guard
Alexis Boyd character Dancer (as Alexis A. Boyd)
Kyndra Reevey character Dancer (as Kyndra 'Binkie' Reevey)
Jay Bird character Concert Guest 'Cowboy'
Natalie Cohen character Poolside Girl
Kevin Fung character Boy at the Grocery Store
Kevin Fisher character Dancer
Jillian Barberie character Herself
Lorne Green character Director
Greg 'G-Spot' Siebel character Photographer
Oliver Muirhead character Butler
Erin Chambers character Press Coordinator
Chris Classic character DJ
Adam Riancho character French Doll (voice)
Axel Alba character Spanish Doll (voice)
Rosero McCoy character Choreographer
Criscilla Anderson character Dancer
Tucker Barkley character Dancer
Celestina Aladekoba character Dancer
Laura Edwards character Dancer
Christopher Scott character Dancer
Miss Prissy character Dancer
Bryan Gaw character Dancer
Michelle Maniscalco character Dancer
Nick Drago character Dancer
Melanie Lewis character Dancer
Ross Bagdasarian, Jr. character Alvin (singing voice) (uncredited)
Janice Karman character Theodore (singing voice) (uncredited)
Steve Vining character Simon (singing voice) (uncredited)
Colette Claire character Bass Player (uncredited)
Sommer Fehmel character Fan (uncredited)
Lisa Mason Lee character Band Member (uncredited)
Rae Sunshine Lee character Concert Attendee (uncredited)
Eddie Mariano character Concert Fan (uncredited)
Meghan Noone character Alvin's Fan (uncredited)
Chris Rossi character Dancer (uncredited)
Jameel Saleem character Band Roadie (uncredited)
Melanie Stephens character Dancing DJ (uncredited)
Brianna Womick character Girl Hit by Stuffed Chipmunk (uncredited)
Maria Zambrana character Afterparty Patron (uncredited)
