'Mean Girls' Commercial Reunites 3 of the 4 Original Stars, Rachel McAdams' Absence Explained

Britney Spears had off-the-charts chemistry with Ryan Gosling in her 2002 audition for The Notebook ... for part that ultimately went to Rachel McAdams

Britney Spears Sobs in 'Notebook' Audition for Rachel McAdams' Allie

8 Stars Auditioned for Allie in 'The Notebook' Before Rachel McAdams Landed the Part