Lou

Rob Corddry

Nick

Craig Robinson

Jacob

Clark Duke

Adam Jr.

Adam Scott

Repairman

Chevy Chase

Sophie

Bianca Haase

Kelly Yates

Collette Wolfe

Jill

Gillian Jacobs

Brad

Kumail Nanjiani

Susan

Gretchen Koerner

Gary Winkle

Jason Jones

Courtney

Kellee Stewart

Terry

Josh Heald

Adam's Fiancee

Collette Wolf

Herself

Lisa Loeb

Herself

Jessica Williams

Himself

Bruce Buffer

Shot Girl

Mariana Paola Vicente

Choozy Doozy Host

Christian Slater

J-Bird

Adam Herschman

DJ

Jason Richard Allan Foster

Bridesmaid

Olivia Jordan

Christine

Christine Bently

Christine

Christine Quinn

Bottle Service Guy

Freddie Poole

Excited Girl

Stacey Asaro

Nerdy PA

Aaron Jay Rome

Financial News Anchor

Darian Trotter

Bridesmaid

Kisha Sierra

Adam (uncredited)

John Cusack

Belligerent Guy at Wedding

Colby Boothman-Shepard

Man at Wedding

Shawn Sanz

Attractive Nurse

Jewel Grosch

Choreographer

Ashley B. Deaton

Dancer

Brianna Nowlin

Dancer

Jennifer Williams

Dancer

Amy Marie Canalis

Dancer

Christina Marie Calamia

Dancer

Cassidy Elizabeth Lefort

Dancer

Kelly Connolly

Angela Kerecz