Amanda Seyfried says she wanted to "go outside her comfort zone" when she took on the role of porn actress Linda Lovelace for her new film.
Lovelace, which is released in cinemas on 23 August, tells the story of how Linda Lovelace became the world's biggest porn star after appearing in one of the most successful adult entertainment movies to date, Deep Throat.
Amanda Seyfried said it was nice to do something that challenged her.
She was talking to Newsbeat's entertainment reporter Chi Chi Izundu.
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