Jennifer Garner as Jenna Rink

Mark Ruffalo as Matt Flamhaff

Judy Greer as Lucy Wyman

Andy Serkis as Richard Kneeland

Kathy Baker as Bev Rink

Phil Reeves as Wayne Rink

Sam Ball as Alex Carlson

Marcia DeBonis as Arlene

Christa B. Allen as Young Jenna

Sean Marquette as Young Matt

Kiersten Warren as Trish Sackett

Joe Grifasi as Mr. Flamhaff

Mary Pat Gleason as Mrs. Flamhaff

Susan Egan as Tracy Hansen

Lynn Collins as Wendy

Renee Olstead as Becky

Alexandra Kyle as Young Tom-Tom

Alex Black as Young Chris Grandy

Ashley Benson as Six Chick

Brittany Curran as Six Chick

Brie Larson as Six Chick

Megan Lusk as Six Chick

Julia Roth as Six Chick

Jeffrey Shane Cohn as Grandy's Friend

George Hine as Grandy's Friend

Philip Pavel as Phil

Sarah Loew as Carla

Maz Jobrani as Glenn

Ian Barford as Pete Hansen

Benita Krista Nall as Waitress at Party

Robinne Lee as Rachel

Justin Burke as 13-Year-Old Boy in Bar

Sara Swain as Sara

Catherine Combs as Catherine

Gia Mantegna as Gina

Sydni Beaudoin as Sydni

Jim Gaffigan as Chris Grandy

Corena Chase as Poise Employee

Crystal Michelle as Poise Secretary

Madeline Sprung-Keyser as Maddy

Richard Whitebear as DJ

Shambo Pfaff as Band Member

John W. Grant as Band Member

Fabrice Calmettes as Band Member

Eron Otcasek as Band Member

Kevin D. White as Yearbook Photographer

Timothy Anderson as Dancer

Adrian Armas as Dancer

Carmit Bachar as Dancer

Rita Maye Bland as Dancer

Douglas Caldwell as Dancer

Tyce Diorio as Dancer

Nadine Ellis as Dancer

Janina Garraway as Dancer

Stacey Harper as Dancer

Brandon Henschel as Dancer

Michael William Higgins as Dancer

Katie Miller as Dancer

Nancy O'Meara as Dancer

Bubba Dean Rambo as Dancer

Caroline A. Rice as Dancer

Kevin Stea as Dancer

Michon Suyama as Dancer

Kadee Sweeney as Dancer

Natalie Willes as Dancer

Darrel W. Wright as Dancer

Kimberly Wyatt as Dancer

Jason Yribar as Dancer

Scout Taylor-Compton as Tiffany (uncredited)

Irena Violette as Partygoer (uncredited)

Tara Battani as Poise Party Guest (uncredited)

Nicole Abisinio as Wardrobe Designer (uncredited)