Despite being absent from last fall's Walmart ad, a source tells PEOPLE that McAdams "would be interested in talking about a sequel" to 'Mean Girls' ...
Mean Girls' is celebrating its 20th anniversary - and Lindsay Lohan (who made a cameo in the new musical film!) is now a wife ...
Spawning a stage show, endless parodies, and a more recent movie musical, Mean Girls is truly a timeless coming-of-age ...