Selena Gomez as Mary Santiago

Drew Seeley as Joey Parker

Jane Lynch as Dominique Blatt

Katharine Isabelle as Bree

Emily Perkins as Britt

Jessica Parker Kennedy as Tami

Marcus T. Paulk as Dustin

Nicole LaPlaca as Natalia Faroush

Alex Zahara as British Director

Stuart Cowan as Debate Team Dude

Giacomo Baessato as Football Jock

Donald Adams as Teacher

Jagoda Janik as Goth Girl

Laura Carswell as Moon-eyed Cheerleader

Lynda Boyd as Evie Parker

Elle-Máijá Tailfeathers as Amazonian Model Girl

Nicole Muñoz as Young Mary - 11 years

Colin Foo as Lee-Ha

Mia Aida Duran as Young Mary - 3 years