Katie Corwin as Katie

Delaney Buffett as Delaney

Zachary Quinto as Henry

Cazzie David as Roxy

Mason Gooding as John

Casey Wilson as Alex

Owen Thiele as Luca

Benjamin Norris as Kyle

Alexander Hodge as Theo

Carmen Christopher as Phil

Miki Ishikawa as Gwen

Heather Mazur as Daria

Michael Rowland as Tommy

Connor Hines as Charlie

Cory Walls as Dougie

Jolie Natalia Handler as Katie (Young)

Keeley Karsten as Delaney (Young)

Holly Bonney as Janet

Hannah Campbell as Mel

Ross Turner as Father of the Bride