Steve Martin

Character: Tom Baker

Eugene Levy

Character: Jimmy Murtaugh

Bonnie Hunt

Character: Kate Baker

Tom Welling

Character: Charlie Baker

Piper Perabo

Character: Nora Baker-McNulty

Hilary Duff

Character: Lorraine Baker

Carmen Electra

Character: Sarina Murtaugh

Jaime King

Character: Anne Murtaugh

Taylor Lautner

Character: Eliot Murtaugh

Alyson Stoner

Character: Sarah Baker

Jonathan Bennett

Character: Bud McNulty

Jacob Smith

Character: Jake Baker

Liliana Mumy

Character: Jessica Baker

Morgan York

Character: Kim Baker

Kevin G. Schmidt

Character: Henry Baker

Forrest Landis

Character: Mark Baker

Brent Kinsman

Character: Nigel Baker

Shane Kinsman

Character: Kyle Baker

Blake Woodruff

Character: Mike Baker

Alexander Conti

Character: Kenneth Murtaugh

Melanie Tonello

Character: Becky Murtaugh

Robbie Amell

Character: Daniel Murtaugh

Courtney Fitzpatrick

Character: Lisa Murtaugh

Madison Fitzpatrick

Character: Robin Murtaugh

Shawn Roberts

Character: Calvin Murtaugh

William Copeland

Character: The Commodore

Peter Keleghan

Character: Mike Romanow

Sam Kalilieh

Character: Doctor

Damon Runyan

Character: Tennis Pro

Graham Losee

Character: Theatre Usher

Seth Howard

Character: Clam Bake Server

Matthew Knight

Character: Theatre Kid

Lee MacDougall

Character: Doobner Dad

Jenny Parsons

Character: Doobner Mom

Dylan Rosenthal

Character: Doobner Older Son

Haylee Wanstall

Character: Doobner Daughter

Ely Henry

Character: Doobner Younger Son

Tre Smith

Character: Security Guard

Adam Shankman

Character: Clam Bake Chef

Shawn Levy

Character: Hospital Intern

Enid Rose

Character: Announcer at Graduation

Kristen Dulmage

Character: Clam Bake Piano Player

Ben Falcone

Character: Theatre Patron

Kelly Keaton

Character: Theatre Patron

Phillip Brock

Character: Theatre Patron

Juliette Goglia

Character: Theatre Patron

Sara Van Horn

Character: Theatre Patron

Nancy Daly

Character: Theatre Patron

Kathryn Joosten

Character: Theatre Patron

Resmine Atis

Character: Theatre Patron (uncredited)

John Eric Brown

Character: Train passenger (uncredited)

Michael Comrie

Character: Sailor (uncredited)

Jonathan Flanigan

Character: EMT (uncredited)

Talia Russo

Character: Lifeguard (uncredited)

Konstantin Shaburov

Character: Waiter at the Party (uncredited)