It’s October 3 – otherwise known as Mean Girls Day!
15 years after the theatrical release of the movie, Lindsay Lohan and her Mean Girls co-stars teamed up for an amazing cause on the fan-created holiday, which honors a line in the movie.
PHOTOS: Check out the latest pics of Lindsay Lohan
Amanda Seyfried, Lizzy Caplan, Lacey Chabert, Jonathan Bennett, Rajiv Surendra, Daniel Franzese, Jan Caruana and Stephanie Drummond all teamed up for a group video.
The cast is raising money for The Thirst Project, which aims to provide safe drinking water to all people in the country by 2022.
Watch their announcement inside…