The biopic, directed by Rob Epstein and Jeffrey Friedman, follows Linda Boreman (Seyfried) as she finds success in the porn industry as Linda Lovelace in the 1972 movie Deep Throat. She later denounced her adult movie career and became a spokeswoman for the anti-pornography movement.
Lovelace co-stars James Franco as Hugh Hefner, Peter Sarsgaard as her abusive husband Chuck Traynor and Adam Brody as her Deep Throat co-star Harry Reems.
Juno Temple, Chloë Sevigny, Eric Roberts and Bobby Cannavale round out the supporting cast.
Lovelace will open in UK cinemas on August 23 and August 9 on limited release in the US.