Justin Long
Role: Alvin (voice)
Matthew Gray Gubler
Role: Simon (voice)
Jesse McCartney
Role: Theodore (voice)
Kimberly Williams-Paisley
Role: Samantha
Tony Hale
Role: Agent Suggs
Bella Thorne
Role: Ashley Grey
Eddie Steeples
Role: Barry
Christina Applegate
Role: Brittany (voice)
Kaley Cuoco
Role: Eleanor (voice)
Anna Faris
Role: Jeanette (voice)
Jose D. Xuconoxtli Jr.
Role: Party Cop #1
Keith Arthur Bolden
Role: Party Cop #2
Joshua Mikel
Role: Wyatt the Pizza Guy
Jeremy Ray Taylor
Role: Kid
Mike Senior
Role: Paparazzi #1
Zeeko Zaki
Role: Paparazzi #2
Jennifer Coolidge
Role: Ms. Price
Uzo Aduba
Role: TSA Officer
Jesica Ahlberg
Role: First Class Flight Attendant
Derryl Rivers
Role: Cab Coordinator
B.J. Winfrey
Role: Clapping Person
Mark Jeffrey Miller
Role: Cab Driver
John Kap
Role: Giant Bearded Guy
Kevin Wayne
Role: Large Cowboy
Tracy Goode
Role: Bus Driver
Denitra Isler
Role: Ticket Agent
Flula Borg
Role: Man Behind Mask
Candace B. Harris
Role: Airline Ticket Agent
Justin Miles
Role: Young Employee
Laura Marano
Role: Hotel Babysitter
David DeSantos
Role: Maitre'd
Shatoya McClintock
Role: Alice
Joseph Lavender
Role: American Idol Bad Auditioner
Hakim Callender
Role: Passing Record Executive
Gabrielle Lexa
Role: Fan #1
Brooke A. Belcher
Role: Fan #2
Onira Tarés
Role: First Record Executive
Leticia Jimenez
Role: Second Record Executive
Stefan Gordy
Role: DJ at Party
Elyse Dufour
Role: Access Hollywood Reporter
Kit Hoover
Role: Access Hollywood Anchor
Autumn Monroe
Role: Parade Woman
John Waters
Role: First Class Passenger
Daryn Kahn
Role: Party Guy
Parker Wierling
Role: Miniature Golf Boy
Greg Pitts
Role: Pool Attendant
Jennifer Joelle Blau
Role: Waitress Passing Lady
Lisandra Silva
Role: Female Bartender
Jelani A. Jackson
Role: Brass Band Member
Nigel J. Burnett
Role: Brass Band Member
Edward Williams
Role: Brass Band Member
Saunders Sermons
Role: Brass Band Member
Ryan Kilgore
Role: Brass Band Member
Clarence Levy III
Role: Brass Band Member
Stephen D. Wilson
Role: Brass Band Member
Edward Platenburg
Role: Brass Band Member
Jonathan Rosenblit
Role: "Alvin" Reader
Ryan Girard
Role: "Simon" Reader
Ronald Ogden
Role: "Theodore" Reader
Katrine Hoyt
Role: Shelbourne Hotel Guest (voice) (uncredited)
Ross Bagdasarian, Jr.
Role: Alvin (singing voice) (uncredited)
Ken La Kier
Role: Photographer (uncredited)
Janice Karman
Role: Theodore / The Chipettes (singing voice) (uncredited)
