- Lindsay Lohan Cady Heron
- Tina Fey Ms. Norbury
- Tim Meadows Mr. Duvall
- Lizzy Caplan Janis
- Rachel McAdams Regina
- Lacey Chabert Gretchen
- Daniel Franzese Damian
- Jonathan Bennett Aaron
- Amy Poehler Mrs. George
- Ana Gasteyer Betsy Heron
- Neil Flynn Chip Heron
- Amanda Seyfried Karen
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