
His first television role was that of Lucinda Marie "Lucy" Montgomery in the hit U.S. series As the World Turns in 2000. It's two years later she landed his second role, that of Joni Stafford on the soap The Force of Destiny (All My Children) but it was not until 2004, the movie Mean Girls, that his career really took off. Amanda Seyfried, who plays Karen Smith, in fact, a girl rather superficial but so much fun, alongside Rachel McAdams and Lindsay Lohan.
Subsequently, she obtained more roles such as Lilly Kane in Veronica Mars series and a role in films like Nine Lives, American Gun and Alpha Dog recently. In 2008, Amanda Seyfried is the daughter of Meryl Streep in the musical Mamma Mia!, Which incorporates the standards of the group ABBA. She is also near Pierce Brosnan, Colin Firth and Julie Walters. It is the second part in Jennifer's Body, a horror comedy.

In 2011, she starred in the movie Red Riding Hood, and then she appeared in Time Out alongside Justin Timberlake. She said in interview that she suffers from anxiety and panic attack. She went out with actor Dominic Cooper from 2008 to 2010 met on the filming of Mamma Mia. She had a short relationship a few months with actor Ryan Phillippe in 2011. In 2012, it is seen alongside Josh Hartnett. Then she will play the famous porn actress Linda Lovelace in Lovelace in 2012.