Marilyn Monroe dress, which prompted veteran star Joan Crawford to describe her behavior as "unbecoming an actress and a lady" to the press. While "Niagara" made Monroe a sex symbol and established her "look", her second film of the year, the satirical musical comedy "Gentlemen Prefer Blondes", established her screen persona as a "dumb blonde". Based on Anita Loos' bestselling novel and its Broadway version, the film focuses on two "gold-digging" showgirls, Lorelei Lee and Dorothy Shaw, played by Monroe and Jane Russell. The role of Lorelei was originally intended for Betty Grable, who had been 20th Century-Fox's most popular "blonde bombshell"
Jayne Mansfield biggest successes, both critically and financially, earning more than "Gentlemen Prefer Blondes" had three years before. Soon afterwards, Fox started promoting Mansfield as "Marilyn Monroe king-sized", attempting to coerce Monroe to return to the studio and finish out her contract. Mansfield had become one of 20th Century Fox's main sex symbol actresses. Mansfield next played a dramatic role in 1957's "The Wayward Bus", an adaptation of John Steinbeck's novel of the same name. With this film, she attempted to move away from her "blonde bombshell" image and establish herself as a serious actress. The film enjoyed moderate box office success,