Overview

• Ashley Tisdale reveals that a line she ad-libbed during her audition for 'Mean Girls' was included in the final film.
• Tisdale auditioned for the role of Karen Smith, which ultimately went to Amanda Seyfried.
• The actress joked about deserving a writer's credit for her contribution.
• Multiple actresses, including Blake Lively, were considered for the role of Karen.
• Tisdale's revelation came during an appearance on 'Watch What Happens Live' with Andy Cohen.