Seyfried has starred in many films, including Mamma Mia! In , Time named her one of the most influential people in the world. Seyfried attended William Allen High School , a large public school in Allentown, where she graduated in She appeared in several print ads for clothing companies, including Limited Too with Leighton Meester , and was featured on three covers of the Sweet Valley High novel series.
While she was initially considered for the lead role of Cady Heron, ultimately played by Lindsay Lohan , the film's producers decided that Seyfried should play Karen Smith, Regina's dim-witted "plastic" friend and sidekick.
That year, she played the supporting character Mouse in the independent film American Gun. She also contributed in a minor role as Julie Beckley in Alpha Dog.
With her role in the HBO drama television series Big Love , Seyfried's profile as an actress grew substantially; the series centered on a fictional fundamentalist Mormon family in which Seyfried plays Sarah Henrickson , Bill and Barb's first daughter, who struggles with her family's polygamous faith. In December , HBO confirmed that Seyfried would return for the show's fourth season , but that it would be her last since she wished to begin concentrating on her film career and other upcoming projects.
Mamma Mia! A Man After Midnight ". In March , Seyfried was cast in the comedy horror film Jennifer's Body as Anita "Needy" Lesnicki, the title character's best friend.
