Amanda Michelle Seyfried (born December 3, 1985) is an American actress, singer-songwriter and former child model. She began her career as a child model when she was 11, and at 15 began her career as an actress, starting off with uncredited roles and moving on to recurring roles on As the World Turns and All My Children.
In 2004, 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, such as 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, Seyfried appeared in her breakthrough and first leading role as Sophie Sheridan in the 2008 musical feature film Mamma Mia!. Other appearances include leading roles in Jennifer's Body (2009), Chloe (2009), Dear John (2010), Letters to Juliet (2010), Red Riding Hood (2011), and In Time (2011).