Dianna Agron is a multi-talented American actress, singer, and director most famous for her breakout role as the complex cheerleader Quinn Fabray on the hit musical series Glee . Beyond the cheerleading uniform, she has built a diverse career in independent film and directing, often bringing a sophisticated, "Old Hollywood" aesthetic to her work and fashion. Quick Facts & Background Dianna Agron: Uncover, Discover, Discard - Bialik Breakdown