October 3 has become a day of celebration for fans of the classic high school movie, in homage to the moment when Aaron Samuels (Jonathan Bennett) asks Cady Heron (Lindsay Lohan) what day it is, and she she answers: "It's October 3rd."
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Lohan honored the movie by posting an image from that scene on her Instagram.
Meanwhile, Bennett suggested on Twitter that his "phone was blowing up" because of Mean Girls Day.
Ok ok! My phone is blowing up so Lets make this a team effort. First let me clear my throat..eh hem.....So...What day is today?
ā Jonathan Bennett (@j_benntt) October 3, 2015
Written by Tina Fey, Mean Girls follows teenager Cady who ends up joining the popular group The Plastics (Rachel McAdams, Lacey Chabert and Amanda Seyfried) after moving to Illinois from Africa.
Mean Girls also features Fey's fellow Saturday Night Live stars Amy Poehler, Ana Gasteyer and Tim Meadows.
In 2011, a sequel called Mean Girls 2 was released straight-to-TV. Meadows was the only returning actor from the original cast, playing the same principal role.
Since Mean Girls catapulted Lohan's career, she has starred in several movies but is perhaps best known for her brushes with the law and party girl antics.
Mean Girls' 20 greatest quotes:
Movies: Mean Girls 20 greatest quotes