Her acting career started with parts from the appearance ( "Ladies of the Chorus" of 1949, "LoveHappy" always 1949 with the Marx Brothers, etc.), then conquer small, but significant, parties that are launching in the firmament of the cinema : in 1950 in "the asphalt Jungle" and "All About Eve", in 1952 with Cary Grant and Ginger Rogers in "Monkeys Business" and others.In 1952 he gets his first starring role, in the role of a mentally unstable babysitter in "do not bother to knock," and in '53 with "Niagara", starring Joseph Cotten, get the worldwide success. In 1953 still he turns "How to Marry a Millionaire" and "Gentlemen Prefer Blondes", with which it confirms one of the biggest stars from the audience. Follow resounding hits like "River of No Return" in 1954 and "The Seven Year Itch" in which Billy Wilder entrusts part of airhead tenant upstairs.In 1954, Marilyn married the famous baseball player, Joe DiMaggio, from whom she divorced within a year. The failure of this relationship also leaves them in a deep wound and indelible, the first in a series that will be destined to expand forever more his feeling of despair and loneliness substantial. After parting with the champion Joe DiMaggio, he moved to New York to study at the Actor's Studio, a commitment which seems to regenerate it and make them momentarily forget his inner troubles.Knows the established playwright, Arthur Miller, a fascinating intellectual who could boast the representation of his plays in the world (to which the famous "A Streetcar Named Desire" by Tennessee Williams original text). And 'love at first sight. Marilyn has the illusion that he had finally found the man of her life and the two married in 1956. The following year he founded with his friend photographer Milton Green, his film production company, Marilyn Monroe Productions, with which run "the Prince and the Showgirl" opposite Laurence Olivier. It 'the first and only film of his production company, as at the box office the film is a real fiasco. As an actress, however, she gets up again just two years later with the hilarious comedy, always the genius Billy Wilder, "Some Like It Hot." Again, the character she played you print indelibly in the minds of viewers.