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