She undertook her first starring film role as Jerri Jordan in Frank Tashlin's "The Girl Can't Help It" (1956). Originally titled "Do-Re-Mi", it featured a high-profile cast of contemporary rock and roll and R&B artists including Gene Vincent, Eddie Cochran, Fats Domino, The Platters and Little Richard. Released in December 1956, "The Girl Can't Help It" became one of the year's biggest successes, both critically and financially, earning more than "Gentlemen Prefer Blondes" had three years before. Soon afterward, 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.