Marilyn Monroe broke through as an actress in 1950 with small, but acclaimed roles in All About Eve and The Asphalt Jungle. She was then a mistress of Johnny Hyde, head of the William Morris Agency. Hyde negotiated a seven year contract with 20th Century Fox and then unexpectedly passed away of a heart attack.

In 1951, Monroe had supporting roles in three Fox comedies: As Young as You Feel, Love Nest, and Let's Make It Legal. With her star on the rise, she received several thousand fan letters a week, and was declared "Miss Cheesecake" by the army newspaper Stars and Stripes.

In early 1952 as she began a much-publicized romance with ex-Yankee Joe DiMaggio, Monroe revealed she’d posed nude in 1949, thus getting ahead of the scandal and gaining sympathy from the public. She explained she’d been broke and needed the money and was soon featured on the cover of Life magazine as the "Talk of Hollywood." Gossip columnist Hedda Hopper declared her the "cheesecake queen" turned "box office smash."

Wanting to improve her acting, she studied hard with Michael Chekhov. Two of Monroe's films — Clash by Night and Don't Bother to Knock — were released soon after to capitalize on public interest. The films showed her range, as Monroe played a fish cannery worker in the former and a disturbed babysitter in the latter.

In Howard Hawks's Monkey Business, she played a secretary opposite Cary Grant. In O. Henry's Full House, with Charles Laughton, she appeared in a passing vignette as a nineteenth-century street walker.

Monroe added to her sex symbol reputation by wearing a revealing dress when acting as Grand Marshal at the Miss America Pageant parade, and told gossip columnist Earl Wilson that she usually wore no underwear. By the end of the year, gossip columnist Florabel Muir named Monroe the "it girl" of 1952.

When Niagara was released in January 1953, women's clubs protested it as immoral. In some scenes, Monroe's body was covered only by a sheet or a towel, considered shocking by contemporary audiences. The film’s most famous scene is a long shot of Monroe from behind walking with hips swaying. Audiences turned out in droves.

The next month, Marilyn Monroe was the guest of Dean and Jerry’s February 24th, 1953 episode.