Amanda Michelle Seyfried (pronounced /ˈsaɪfrɪd/ SYE-frid; 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 eleven and when she was fifteen she began her career as an actress; starting off with an uncredited role and going on to have a recurring role on a television series, which expanded into her having a successful television career.
In 2004, Seyfried made her film debut in Mean Girls playing Karen Smith, the ditziest of the so called ‘plastics’. She then went on to other films including Nine Lives (2005) and Alpha Dog (2007). In 2008, after landing a lead role on HBO’s popular television series, Big Love, in 2006, Seyfried appeared as Sophie Sheridan in the musical feature film Mamma Mia!. Other recent notable appearances include lead roles in Jennifer’s Body and Chloe in 2009, and one of the two lead roles in Dear John the following year. —wikipedia