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!