Before she was a "Mean Girl," Rachel McAdams was just a short-haired third grader in St. Thomas, Ontario.
A loyal TMZ reader sent us her third grade class photo with her classmate, Miss McAdams. While we certainly couldn't recognize her from the plaid, knee-high dress -- who could miss Rachel's trademark wide-mouthed grin?
We called and emailed Rachel's reps to confirm it's her, but we didn't hear back. What do you think?