That was over 17 years ago in 2004.
Today she is 42, and has starred in 32 movies in total, 27 since Mean Girls was released.
In Mean Girls, I think Rachel McAdams looks:
Mean Girls scores 7 out of 10 on The Movie Database.
Rachel McAdams' first acting role was as 'Jessica Spencer/Clive Maxtone' in The Hot Chick, released in 2002 when she was 24.
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