Adult film star Marilyn Chambers, who became the face of the “porno chic” movement of the ’70s, has died at 57. The star of one of the most famous adult movies in history, “Behind the Green Door,” Marilyn Ann Briggs started out a far cry from the adult industry. Born into a middle-class family and raised in Providence, Rhode Island, her most famous mainstream modeling gig was as a mother holding a baby on the cover of a box of Ivory Snow soap. In 1972, the San Francisco-based Mitchell brothers approached Chambers about starring in “Green Door.” After the movie’s premiere, Proctor & Gamble dumped her from their Ivory Snow campaign and recalled all product and advertising with her image on it. Over the following years, Chambers continued to return to the adult movie industry and confessed to having struggled with alcohol and drug addictions. Yesterday, she was found dead in her Santa Clarita mobile home by her daughter. The cause of death remains unknown.