Seyfried, 27, played the character of Linda Lovelace in the biopic that required her to go topless in a number of scenes, reported Daily Mail.
"The first thing you think about is that it could ruin my career," she said.
But the actress admitted that later during the shoot she became unfazed by it.
"It's funny, because I felt liberated when I was doing it. I'm sure people that are very protective of me wouldn't feel very comfortable with that, but it's like, what's the big deal?," she said.