PARK CITY - Amanda Seyfried was center stage Tuesday night at the world premiere of her new movie "Lovelace" at the 2013 Sundance Film Festival.  Seyfried, who an currently be seen in the Oscar nominated "Les Miserables," plays Linda Lovelace in the biopic about the infamous star of "Deep Throat."

"Lovelace" traces Linda's abusive relationship with one-time husband Chuck Traynor (Peter Sarsgard) and how he forced her to essentially become a porn star and hooker through violence.  While the re-enactments of "Deep Throat" are entertaining and mostly for comedic effect, the film has a serious dark side the was tough for Seyfried to take.

Speaking on the red carpet before the premiere Seyfried reveals she had three weeks after playing Lovelace to segue into, ironically, the happier role of Cosette in 'Les Miserables.' She says, "Thank god for that, because this was really intense."

One reason Seyfried took the role was because of her admiration for directors Rob Epstein and Jeffrey Friedman ("Howl," "The Celluloid Closet").

"They made me feel safe immediately," Seyfried says. "I was like, 'I have to do this movie with you guys.'  The script was perfect and they are so amazing."

And yes, there is nudity and sex scenes in "Lovelace," but working with Sarsgard made that almost a breeze.

"[Peter is] the easiest person to do anything with," Seyfried says. "You can be like, 'Drop you pants' and he's 'Alright.' We had no hang ups really, to be honest. If one of us hand hang ups it would be uncomfortable for the other one. We were just a team the whole time, we knew what we were doing and nothing was really sexual. It appears sexual on screen, but it's not. The violence is really more of an issue I think for him to get to and for me to react to. I had to go someplace else. It's not hard to pull yourself out of that sometimes. So, it was a tough shoot, but I enjoyed it for the whole experience."

Lovelace, whose real last name was Boreman, died in 2002 after a severe car accident. If she were alive today Seyfried admits she has no idea what she'd ask her.

"I would just want to know her," Seyfried says. "Just hug her and just sit and talk to her. It's weird. It's easier that she's not around I guess. Maybe not. I just wanted to give her a voice.

For more from Seyfried watch the video of HitFix's interview embedded at the top of this article.

"Lovelace" was acquired by Radius-TWC just hours after its Sundance premiere and should hit theaters and VOD sometime in 2013.