In 2004, Amanda Michelle Seyfried made her film debut in Mean Girls playing Karen Smith, the ditziest of the so-called "Plastics". Her subsequent roles as a supporting character were in independent films like Nine Lives (2005) and Alpha Dog (2006). She also had a recurring role in the UPN TV show Veronica Mars (2004-2006). Between 2006 and 2010, she landed a lead role on HBO's popular television series Big Love. After that, Amanda Michelle Seyfried appeared in her breakthrough and first leading role as Sophie Sheridan in the 2008 musical feature film Mamma Mia!. Other recent appearances include successful leading roles in Jennifer's Body (2009), Chloe (2010), Dear John (2010), Letters to Juliet (2010), and Red Riding Hood (2011).
