What is Amanda Seyfried's net worth? The American actress, singer, and former model has a net worth of $12 million, according to Celebrity Net Worth. Seyfried began her career as a child model, then focused on acting, landing a recurring role on the soap opera 'As the World Turns' in 1999. She made her big-screen debut in 2004, playing Karen Smith in Tina Fey's 'Mean Girls' which grossed $130 million at the box office. She then went on to star on the HBO drama 'Big Love' from 2006 to 2011 and she has since appeared in more than 30 feature films, including 'Mamma Mia!' (2008) and its 2018 sequel, Chloe (2009) 'Les Misérables' (2012), 'A Million Ways to Die in the West' (2014) and 'Ted 2' (2015). 'Les Misérables' earned $441.8 million at the box office and won dozens of awards while 'Mamma Mia!' where she co-starred with Meryl Streep brought in $615.7 million at the box office.