Matthew Gray Gubler
Simon (voice)
Jesse McCartney
Theodore (voice)
Allison Karman
Female Intern 1
Tiara Parker
Female Intern 2
Kira Verrastro
Female Intern 3
Beth Riesgraf
Mother in Store
Greg 'G-Spot' Siebel
Photographer
Jayden Lund
Security Guard
Erin Chambers
Press Coordinator
Jillian Warry Barberie
Jillian Reynolds
Adam Riancho
French Doll (voice)
Axel Alba
Spanish Doll (voice)
Rosero McCoy
Choreographer
Celestina Aladekoba
Dancer
Michelle Maniscalco
Dancer
Natalie Cohen
Poolside Girl (uncredited)
Ross Bagdasarian, Jr.
Alvin (singing voice) (uncredited)
Janice Karman
Theodore (singing voice) (uncredited)
Lisa Mason Lee
Band Member (uncredited)
Rae Sunshine Lee
Concert Attendee (uncredited)
Meghan Noone
Alvin's Fan (uncredited)
Chris Rossi
Dancer (uncredited)
Jameel Saleem
Band Roadie (uncredited)
Melanie Stephens
Dancing DJ (uncredited)
Gregg Lee
Concert Attendee (uncredited)