I Love You, Man

Paul Rudd

As Peter Klaven

Jason Segel

As Sydney Fife

Rashida Jones

As Zooey Rice

Andy Samberg

As Robbie Klaven

J.K. Simmons

As Oswald Klaven

Jane Curtin

As Joyce Klaven

Jon Favreau

As Barry

Jaime Pressly

As Denise

Rob Huebel

As Tevin Downey

Thomas Lennon

As Doug

Sarah Burns

As Hailey

Lou Ferrigno

As Lou Ferrigno

Greg Levine

As Hailey's Date

Jean Villepique

As Leanne

Kym Whitley

As Female Co-Worker

Colleen Crabtree

As Female Co-Worker

Caroline Farah

As Female Co-Worker

Mather Zickel

As Gil

Aziz Ansari

As Eugene

Nick Kroll

As Larry

Liz Cackowski

As Zooey's Friend

Kulap Vilaysack

As Zooey's Friend

Catherine Reitman

As Zooey's Friend

Carla Gallo

As Zooey's Friend

Vicki Davis

As Zooey's Friend

Josh Cooke

As Alan (Bench Press Guy)

Jay Chandrasekhar

As Barry's Buddy

Seth Morris

As Barry's Buddy

James P. Engel

As Barry's Buddy

Jerry Minor

As Berry's Buddy

Joe Lo Truglio

As Lonnie (Voice Crack Guy)

Murray Gershenz

As Mel Stein

Keri Safran

As JAR Waitress

Greg Tuculescu

As Open House Couple

Ian Roberts

As Venice Broadwalk Jogger

Bob Cicherillo

As Venice Boardwalk Bodybuilder

Ethan S. Smith

As Sidney's Buddy

Nelson Franklin

As Sidney's Buddy

Ping Wu

As Mr. Chu

Jill Bartlett

As Woman Leaving Sydney's House

Matt Walsh

As Impatient Golfer

Geddy Lee

As Geddy Lee - Rush

Alex Lifeson

As Alex Lifeson - Rush

Neil Peart

As Neil Peart - Rush

Melissa Rauch

As Woman Jogger Yelling at Sydney

David Wain

As Wedding Photographer

Raquel Bell

As Saks Fifth Avenue Saleswoman

Larry Wilmore

As Justice Of The Peace

Dennis James Anderson

As Hank Mardukas

Craig Wedren

As Wedding Band

Damian Kulash

As Wedding Band

Tim Nordwind

As Wedding Band

Dan Konopka

As Wedding Band

Andy Ross

As Wedding Band

David Krumholtz

As Sydney's Buddy (uncredited)

Sidow Sobrino

As Rush Concert Fan (uncredited)