The pretty blonde signed on as the porn star who became an anti-porn activist last year, and movie executive Patrick Muldoon reveals Seyfried is taking some big risks with the saucy role.
He tells Eonline.com: "It's very risque and there will be lots of nakedness in the movie, especially for Seyfried. It's a new thing for her."
But the producer insists his star won't be remembered for baring all in the film - fans will love her profound performance.
He adds: "She's doing such an amazing job. We're about two weeks into filming, and the movie's going to be incredible.
"Thematically, it's (the movie) talking about how abusive the porn industry was to Linda Lovelace. Yes, there's a lot of nudity, but it's a message movie about respecting women."
The actress will appear alongside Peter Sarsgaard in the film, while Demi Moore recently signed on to portray feminist Gloria Steinem.
Seyfried has ventured into risque roles before - in 2009's Chloe she also had to bare all and kiss actress Julianne Moore.
But she has often chosen safer roles in movies including Mean Girls, Letters to Juliet, Red Riding Hood and Mamma Mia!