Cady Heron (Lohan) is a hit with The Plastics, the A-list girl clique at her new school, until she makes the mistake of falling for Aaron Samuels (Bennett), the ex-boyfriend of alpha Plastic Regina George (McAdams).
Two wealthy sisters, both heiresses to their family's cosmetics fortune, are given a wake-up call when a scandal and ensuing investigation strip them of their wealth.