After several calls and turned-down job offers from Central Casting, Harlean was pressured by her mother (now relocated to Los Angeles) into accepting work. Harlean then appeared in her first film,
Honor Bound as an unbilled extra, for $7 a day. This led to several other roles, and Harlean landed bit parts in silent films such as,
Why Is a Plumber? (1927),
Moran of the Marines (1928) and
The Love Parade (1929). She had more substantial roles in
Laurel and Hardy's short
Double Whoopee, and the
Clara Bow vehicle
The Saturday Night Kid, both in
1929. Under pressure from Harlean's career ascent, she and Chuck McGrew separated in June 1929, and Harlean moved in with her mother and Bello.
During filming of
Weak But Willing in 1929, she was spotted by James Hall, an actor in a then-shooting
Howard Hughes film called
Hell's Angels. Hughes, re-shooting the film from
silent into
sound, needed a new actress as the original actress
Greta Nissen's Norse accent proved undesirable for a
talkie. Harlean met briefly with Hughes and was hired on the spot. Hughes signed Jean Harlow to a five-year
contract on
October 24,
1929. It was during shooting that Harlow would meet MGM executive
Paul Bern.
Hell's Angels premiered in Hollywood on
May 27,
1930 at
Grauman's Chinese Theater.
Harlow was a sensation with audiences, but critics were less than besotted.
The New Yorker called Harlow "plain awful".
Variety was a bit more lenient in remarking, "It doesn't matter what degree of talent she possesses....nobody ever starved possessing what she's got", referring to her sex appeal. In 1931, loaned out by Hughes' Caddo Company to other studios, Harlow began to gain more attention when she appeared in
The Public Enemy (with
James Cagney),
Goldie,
The Secret Six (with
Wallace Beery and
Clark Gable), and
Platinum Blonde with
Loretta Young. In fact, Hughes convinced the producers of "Platinum Blonde" to rename it from its original title of "Gallagher" in order to promote Harlow's image. Though the films ranged from moderate to smash hits, Harlow's acting ability was damned by critics as awful and was mocked, with some saying she ruined any scene she was in.
Concerned of Harlow's status, Hughes sent her on a personal appearance tour of the East Coast in late 1931. To the surprise of many, especially Harlow herself, she packed every theatre she appeared in, often appearing multiple nights in one venue. Despite critical assailment and poor roles, Harlow's popularity and following was large and growing, to the extent that the tour was extended through early
1932. Many of Harlow's female fans were dying their hair platinum to match hers. To capitalize on this craze, Hughes' team organized a series of "Platinum Blonde" clubs across the nation, with a prize of $10,000 to any beautician that could match Harlow's shade.
Apprised of this, Paul Bern (now romantically involved with Harlow) spoke to
Louis B. Mayer about buying out Harlow's contract from Hughes and signing her to
MGM. Mayer would have none of it. MGM's leading ladies were just that, and Harlow's silver screen image was that of a floozy, which was abhorrent to Mayer. Bern then began urging good friend
Irving Thalberg, production head of MGM, to sign Harlow, noting Harlow's pre-existing popularity and established image. After initial reticence, Thalberg agreed, and on
March 3,
1932, Harlow's twenty-first birthday, Bern called with the news that MGM had bought Harlow's contract from Hughes for $30,000. Harlow would afterwards be required to report to MGM and officially joined the studio on
April 20,
1932.