Parker will play the feminist author and activist Gloria Steinem after Moore left the project last week citing personal reasons.
Amanda Seyfried and Peter Sarsgaard star in the biopic of porn star Linda Lovelace. Rob Epstein and Jeffrey Friedman are directing from an original screenplay by Andy Bellin.
Production is underway in Los Angeles on the Millennium Films drama. Heidi Jo Markel produces for Eclectic Pictures with Laura Rister and Jason Weinberg of Untitled Entertainment and Jim Young of Animus Films.