Justin Long

Character: Adam

Cobie Smulders

Character: Allison

Ryan Hansen

Character: Aaron

John Cho

Character: Mark

Kristen Schaal

Character: Talula

Peter Gallagher

Character: Orson Schwartzman

Dana Delany

Character: Wendy (Allison's Mom)

Rick Overton

Character: Dean (Allison's Dad)

Lea Thompson

Character: Deb (Adam's Mom)

Brady Rubin

Character: Grandma Rose

Luis Guzmán

Character: Federico

Ginger Gonzaga

Character: Helen

Lo Mutuc

Character: Claire

Briga Heelan

Character: Julie

Parvesh Cheena

Character: Rohan

Malcolm Barrett

Character: Greg

Dov Tiefenbach

Character: David

Charlotte McKinney

Character: Charlotte

Manu Intiraymi

Character: Lee

Barbara Browne

Character: Susan

André Tardieu

Character: Jean-Pierre

Talia Toms

Character: Leandra (Bridesmaid)

Adam Rose

Character: Alan (Co-Worker)

Sam Hennings

Character: Priest (Father Jack)

Ser'Darius Blain

Character: Wedding DJ

Emerson Min

Character: Emerson

Ivy George

Character: Ivy (Flower Girl)

Babar Peerzada

Character: Chaplin (Lead Busboy)

Gabriel Berber

Character: Busboy 1

Victor Douglas

Character: Busboy 2

Ricardo Martín

Character: Wedding Photographer

James Krisel

Character: Guy at Party

Vella Lovell

Character: Jen (uncredited)

Andrea LeBlanc

Character: Lindsay (uncredited)

Patrick Rafferty

Character: Elevator Tourist (uncredited)

Mike Guerra

Character: Engaged Couple (uncredited)

Ashley Platz

Character: Engaged Couple (uncredited)