Mansfield's husband at the time, Paul Mansfield, hoped the birth of their child would discourage her interest in acting. When it did not, he agreed to move to
Los Angeles in late 1954 to help further her career. Between a variety of odd jobs, including a stint as a candy vendor at a movie theatre, Mansfield studied drama at
UCLA. Her
movie career began with bit parts at
Warner Brothers. She had been signed by the studio after one of its talent scouts discovered her in a production at the
Pasadena Playhouse. Mansfield had small roles in
Female Jungle (1954), and in
Pete Kelly's Blues (1955) which starred
Jack Webb.
In 1955
Paul Wendkos offered her the dramatic role of Gladden in
The Burglar, his film adaptation of
David Goodis' novel. The film was done in
film noir style, and Mansfield appeared alongside
Dan Duryea and
Martha Vickers.
The Burglar was released two years later when Mansfield's fame was at its peak. She was successful in this straight dramatic role, though most of her subsequent film appearances would be either comedic in nature or capitalize on her sex appeal. She made two more movies with
Warner Brothers, one of which gave her a minor role as Angel O'Hara, a hitman's mistress, opposite
Edward G. Robinson in
Illegal (1955).
Returning to Hollywood from a successful run with
Will Success Spoil Rock Hunter, the 1955
Broadway production in
New York, she starred in
Frank Tashlin's camp comic film
The Girl Can't Help It (1956). Mansfield's first starring role featured her as an outrageously voluptuous but tone-deaf girlfriend of a retired racketeer. He hires a talent agent to try to transform her into a movie star and in the process the pair fall in love. The film is a high energy romp and features some early rock-and-roll performances from
Fats Domino, the
Platters and
Little Richard.
On
May 3,
1956, Mansfield signed a long-term
contract with
20th-Century Fox. She then played a straight dramatic role (albeit as a stripper) in
The Wayward Bus in 1957. With her role in this film she attempted to move away from her "dumb blonde" image and establish herself as a serious actress. This film was adapted from
John Steinbeck's novel, and the cast included
Dan Dailey and
Joan Collins. The film enjoyed reasonable success at the box office.
She won a
Golden Globe in 1957 for
Most Promising Newcomer - Female, beating
Carroll Baker and
Natalie Wood, for her performance as a "wistful derelict" in
The Wayward Bus. It was "generally conceded to have been her best acting," according to
The New York Times, in a fitful career hampered by her flamboyant image, squeaky voice ("a soft-voiced coo punctuated with squeals"), almost comically voluptuous figure, and limited acting range.
Mansfield reprised her role of Rita Marlowe in the 1957 movie version of
Will Success Spoil Rock Hunter?, co-starring
Tony Randall and
Joan Blondell.
The Girl Can't Help It and
Will Success Spoil Rock Hunter? were popular successes in their day and are considered classics. Her fourth starring role in a Hollywood film was
Kiss Them for Me (1957) in which she received prominent billing alongside
Cary Grant. However, in the film itself she is little more than comedy relief while Grant's character shows a preference for a sleek, demure redhead portrayed by fashion model
Suzy Parker.
Kiss Them for Me was a box-office disappointment and would prove to be her final starring role in a mainstream Hollywood studio film. She was also offered a part opposite
Jack Lemmon in
Bell, Book and Candle but had to turn it down due to pregnancy.
Despite her monumental publicity and public popularity, good roles dried up for Mansfield after 1959. The actress nevertheless kept busy in a series of low-budget films, mostly in Europe. These showed off as much of her anatomy as possible, but used little of her acting or comedic talents.
Fox tried to cast Mansfield opposite
Paul Newman in his ill-fated first attempt at comedy,
Rally Round The Flag, Boys, but Newman's
Wayward Bus co-star
Joan Collins was selected for the role. In 1960 Fox lent her to appear in two independent gangster thrillers in England. These were
Too Hot to Handle, which was directed by
Terence Young and co-starred
Karlheinz Böhm, and
The Challenge, co-starring
Anthony Quayle. Fox also lined up
It Happened in Athens. This Olympic-themed movie was filmed in Greece and would not be released until 1962. Despite receiving top billing in
It Happened in Athens, Mansfield was relegated to a colorful, scantily-clad supporting role.
In 1963, the comedian turned producer-screenwriter
Tommy Noonan persuaded Mansfield to become the first mainstream American actress to appear in the nude with a starring role in the film
Promises! Promises!. Photographs of a naked Mansfield on the set were published in
Playboy. In one notorious set of images Mansfield stares at one of her breasts, as does her male secretary and a hair stylist, then grasps it in one hand and lifts it high. The sold-out issue resulted in an obscenity charge for
Hugh Hefner which was later dropped.
Promises! Promises! was banned in Cleveland, but it enjoyed box-office success elsewhere. As a result of the film's success, Mansfield landed on the Top 10 list of Box Office Attractions for that year. The autobiographical book,
Jayne Mansfield's Wild, Wild World, she wrote together with Mickey Hargitay, was published right after
Promises! Promises! and contains 32 pages of black-and-white photographs from the film printed on glossy paper.
In 1963 Mansfield appeared in the low-budget
West German movie
Homesick for St. Pauli with Austrian-born
schlager singer
Freddy Quinn. She played Evelyne, a sexy American singer who traveling to
Hamburg by ship. She is followed by an
Elvis-like American pop star played by Quinn. Mansfield sang two German songs in the movie, though her speaking voice was dubbed. She remained a highly visible personality despite her film career setbacks for her publicity antics and stage performances.