Lindsay Lohan stars as Cady Heron, a 16 year old homeschooled girl who gets to experience public school and gets a quick primer on the cruel, tacit laws of popularity that divide her fellow students into tightly knit cliques. She not only makes the mistake of falling for Aaron Samuels (Jonathan Bennett), the ex-boyfriend of queenbee Regina George (Rachel McAdams), but unintentionally joins The Plastics, led by Regina herself. Join Cady as she learns that high school life can be really tough.