It's Mean Girls Day and in celebration of the cult classic, we look back at the Irish heritage and ancestry of the movie's star Lindsey Lohan. 

Lindsay Lohan was born in 1986 in New York City and moved to Long Island soon after she was born.

The most important day of the year. #MeanGirlsDay pic.twitter.com/ooLLQ3YkpZ

— Mean Girls (@MeanGirls) October 3, 2018

Her mother Dina  Sullivan came from a well known Irish American family that traced its roots back to County Cork.

They were politically conservative and Lindsay’s grandfather John L. Sullivan founded the Long Island Pro-Life Party.

Dina had her own stage ambitions and worked as a singer and dancer.

Read more: The most famous people in the world with Irish roots

14 years ago today, I asked @lindsaylohan what day it is. #MeanGirlsDay pic.twitter.com/4mzCwatILg

— Jonathan Bennett (@JonathanBennett) October 3, 2018

She met and married  Michael Lohan – another Irish Catholic with Cork roots and a flair for the dramatic. Michael described his father, Richard Lohan, as an alcoholic.

Lindsay was pushed into the limelight early; at age 3 she was in ads for Calvin Klein Kids and Abercrombie kids.

By age 10 she was in movies and hit the big time at 12 starring in Disney's "The Parent Trap" in 1998. 

Read more: Eleven early Hollywood stars with Irish roots

After a few tumultuous years, Lohan remained out of the spotlight but is set to make her grand return this year with a new MTV reality show. 

Lindsay Lohan walks the red carpet of Firenze4ever 14th Edition Party hosted by LuisaViaRoma on January 9, 2017, in Florence, Italy. Stefania D'Alessandro/Getty Images for LuisaViaRoma