Lindsay Lohan celebrates ten year anniversary of movie Mean Girls Credit: Courtesy Lindsay Lohan; Inset: Charles Sykes/Bravo/NBCU Photo Bank

On Wednesdays, they wear pink! Lindsay Lohan and Amanda Seyfried celebrated the 10th anniversary of the famed Mean Girls flick on Wednesday, April 30.

The actress, who starred in the 2004 film as teenager Cady, took to her Instagram to wish Tina Fey's hit film a happy birthday.

The OWN reality star posted a sketch from the scene where the male character Damian attends the school's all girls emergency meeting, shouting the classic line: "She doesn't even go here!" The 27-year-old captioned the pic: "He has a point #happybirthday #10years #MeanGirls."

Lohan's shout out follows former costar Seyfried's, who also sent the movie love. Seyfried, who played the not so sensible Karen, tweeted: "On Wednesdays we wear pink," along with a pic of her character. 

The actress is also using the anniversary for a good cause. Playing off one of the film's many catch phrases, "you can't sit with us," Seyfried posted a photo to her Instagram which read: "You can sit with us."

Along with the photo, a caption read: "In honor of the 10 year anniversary of Mean Girls, I alongside @kindcampaign say to you, "You CAN sit with us." Repost this picture with the hashtag #youcansitwithus in an effort to bring an end to girl-against-girl bullying. #youcansitwithus #eventhoughyourenotwearingpink."

Happy Birthday, Mean -- and nice -- Girls!