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. She played Paige Oppenheimer, one of the lead roles in the ensemble movie. On February 22, , Seyfried presented an award and performed at the 81st Academy Awards ceremony.
In early March , director Zack Snyder had tapped Seyfried to portray the lead role, Baby Doll, in Sucker Punch , [ 22 ] but Seyfried had to drop out of the film due to scheduling conflicts with Big Love. Seyfried starred alongside Channing Tatum in Dear John , the film adaptation of the novel of the same name that was written by Nicholas Sparks.
