Rachel McAdams
Regina George
Lacey Chabert
Gretchen Wieners
Amanda Seyfried
Karen Smith
Jonathan Bennett
Aaron Samuels
Rajiv Surendra
Kevin Gnapoor
Diego Klattenhoff
Shane Oman
Molly Shanahan
Kristen Hadley
Elana Shilling
Spelling Girl
Graham Kartna
Homeschooled Boy
Ely Henry
Homeschooled Boy
David Aherne
Homeschooled Boy
Ayo Agbonkpolo
African Warrior
Jonathan Malen
Kristen's Boyfriend
Miranda Edwards
Michigan Girl
Les Porter
Chemistry Teacher
Eve Crawford
English Teacher
Jack Newman
History Teacher
Michelyn Emelle
Music Teacher
Bathsheba Garnett
German Teacher
Danielle Nguyen
Sun Jin Dinh
Alisha Morrison
Lea Edwards
Julia Chantrey
Amber D'Alessio
Jacky Chamberlain
Giselle Sgro
Olympia Lukis
Jessica Lopez
Stefanie Drummond
Bethany Byrd
Jessie Wright
Cady 5 Years Old
Stephan Dickson
Animal Dancer
Andreja Punkris
Animal Dancer
Noelle Boggio
Animal Dancer
Alexandra Stapley
Taylor Wedell
Laura de Carteret
Mrs. Wedell
Erin Norah Thompson
Dawn Schweitzer
Michelle Hoffman
Kissing Girl
Valerie Casault
Kissing Girl
Sharron Matthews
Joan the Secretary
Randi Lee Butcher
Skater Girl
Kaylen Christensen
Jock Girl
David Sazant
Marymount Captain
Clare Preuss
Caroline Krafft
Bruce Hunter
Mathlete Moderator
Megan Millington
Junior Plastic
Tara Shelley
Junior Plastic
Shannon Todd
Junior Plastic
David Reale
Glenn Coco (uncredited)
Krysta Carter
Wannabe (uncredited)