Anne Hathaway (Kym Buchman)
Rosemarie DeWitt (Rachel Buchman)
Bill Irwin (Paul Buchman)
Tunde Adebimpe (Sidney Williams)
Debra Winger (Abby)
Matthew Stadelmann (12-Step First-Timer)
Pastor Melvin Jones (12-Step Speaker)
Sister Carol East (Wedding Band Performer)
Robyn Hitchcock (Wedding Band Performer)
Carol Jean Lewis (Sidney's Mom)
Roger Corman (Party Guest with Movie Camera)
Fab Five Freddy (Wedding Performer)
Sebastian Stan (Walter, bowtie party guest)
Kyrah Julian (Sidney's Sister)
Quincy Tyler Bernstine (12-Step Receptionist)
Annaleigh Ashford (Quick Stop Cashier)
Darrell Larson (12-Step Group Leader)
Michele Federer (12-Step Reader)
Zafer Tawil (Violin Friend)
Tamyra Gray (Singing Friend)
Elizabeth Hayes (Susanna Galeano)
Robert W. Castle
Roslyn Ruff (Rosa)
Innbo Shim (Wedding Planner)
Victoria Haynes (Bridesmaid)
Beau Sia (Wedding Czar)
Mather Zickel (Kieran)
Anna Deavere Smith (Carol)
Anisa George (Emma)
Jerome LePage (Andrew)