The two quickly became close friends. Monroe even lived with Greene and his family in their Connecticut farmhouse prior to her marriage to playwright Arthur Miller. Over four years of collaboration, Greene snapped Monroe in 52 different photographic sessions; the 3,700 images up for auction come from this period.
Other high-profile celebrity images included in the larger collection include Steve McQueen, Paul Newman, Kim Novak, Elizabeth Taylor, Cary Grant and Audrey Hepburn. All images go up for auction on July 27.