Mark Waters Director Lindsay Lohan Cady Heron Actor Rachel McAdams Regina George Actor Tina Fey Mrs. Norbury Actor, Screenwriter Tim Meadows Mr. Duvall Actor Amy Poehler Mrs. George Actor Ana Gasteyer Cady's Mom Actor Lacey Chabert Gretchen Wieners Actor Lizzy Caplan Janis Ian Actor Daniel Franzese Damian Actor Neil Flynn Cady's Dad Actor Jonathan Bennett Aaron Samuels Actor Amanda Seyfried Karen Smith Actor Wai Choy Tim Pak Actor Olympia Lukis Jessica Lopez Actor Jonathan Malen Kristen's Boyfriend Actor David Sazant Marymount Captain Actor Elana Shilling Spelling Girl Actor Lorne Michaels Producer Jill Sobel Messick Executive Producer Daryn Okada Cinematographer Wendy Greene Bricmont Film Editing Rolfe Kent Original Music Robin D. Cook Casting Marci Liroff Casting Cary White Production Design Brandt Gordon Art Director Patricia Cuccia Set Decoration Mary Jane Fort Costume Design