Norma Jeane Baker, the girl who was later to become Marilyn Monroe, was born June 1st, 1926. I'm a Gemini. That means intellect," sign of the twins and many biographers have discovered that one important clue to the way in which Marilyn conducted her life, and reacted to events around her, is that she was always conscious of being two people. Two in One, the me was always Norma Jean; Marilyn Monroe was the glittering shell which surrounded that eternal child.