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