Photos obtained by TMZ show the women together on set in Los Angeles Friday -- and they all were relaxed and smiling.
Lindsay was holding a pocketbook labeled, "Plastic Clubs Member, Est. 2004," which was the name of the "Mean Girls" group in the flick. The bag also featured their notable tagline, “On Wednesdays, we wear pink.”
Seyfried and Chabert were posing for snapshots in a convertible car and on a football field.
For anyone who doesn't know, "Mean Girls" was a massive success at the box office and starred Lindsay as Cady Heron, Amanda as Karen Smith and Lacey as Gretchen Wieners. The plot follows Cady as she moves to suburban Illinois and enrolls in a public high school, where she joins a "Mean Girls" clique.
Meanwhile, Lindsay had her first baby with husband Bader Shammas in July. The couple named the boy, Luai.