Marilyn became a Christian Scientist at the age of 18; later in her life she dabbled in alternative spiritualities, including Anthroposophy, the philosophy espoused by Rudolf Steiner. She converted to Judaism before her 1956 marriage to Arthur Miller.
Her weight went up and down so dramatically during the filming of The Prince and the Showgirl that the costume designer, Beatrice Dawson, had to create facsimile dresses in different sizes. “I have two ulcers from this film,” she said, “and they're both monogrammed MM.”
She was rarely without an acting coach. Her first, Natasha Lytess, worked with her for six years and 22 films, clashing with directors, whose authority she challenged, and studio heads, who paid her bills. (Marilyn also paid her a wage - and settled her £11,000 debt at the dentist.)