Russell Brand

as Arthur

Helen Mirren

as Hobson

Greta Gerwig

as Naomi Quinn

Jennifer Garner

as Susan Johnson

Geraldine James

as Vivienne

Luis Guzmán

as Bitterman

Nick Nolte

as Burt Johnson

Peter Van Wagner

as Naomi's Dad

Christina Jacquelyn Calph

as Tiffany

John Hodgman

as Peter, Candy Store Manager

Murphy Guyer

as Officer Kaplan

Saul Stein

as Officer #2

José Ramón Rosario

as Employment Clerk

John Hodgman

as Candy Store Manager

Scott Adsit

as Gummy Bear Man

Evander Holyfield

as Boxing Trainer

Robert Clohessy

as Veteran Cop

Ed Herbstman

as Rookie Cop

Jared Parker

as Wedding Kid

Tom Toner

as Wedding Priest

Richard Bekins

as Chancellor

Matt Malloy

as Spoon Guy

Nigel Barker

as Photographer

Tuffy Questell

as Tito

Sara Chase

as Journalist #1

Ali Reza

as Journalist #2

Brian McElhaney

as College Student

Charlie Hewson

as Receptionist / Best Man

Peter Brouwer

as Auctioneer

Stink Fisher

as Foreman

Debbie Lee Jones

as Kissed Woman

Pascal Yen-Pfister

as Maitre D'

Dylan Clark Marshall

as Boy on Tour

Steve Rosen

as Grand Central Waiter

Leslie Hendrix

as Alice Johnson

George Feaster

as James

Ed Jewett

as Group Leader

John Carrafa

as Choreographer

Jennie Eisenhower

as Maid of Honor

Sean Tarjyoto

as Bookstore Clerk

Pamela Stewart

as Librarian

Skai Jackson

as Library Girl #1

Tori Feinstein

as Library Girl #2

Jackson Nicoll

as Library Boy #1

Devin Almonte

as Susan's Bridesmaid (uncredited)

Jamie Choi

as Bridesmaid (uncredited)

Tatsumi Romano

as Tour Girl (uncredited)

Chelsey Donn

as Clerk (uncredited)