Goin' to Town (1935)

When her fiancé is killed, dancehall queen Cleo Borden inherits his wealth. Included are oil wells overseen by British engineer Carrington, whom Cleo sets out to win by becoming a 'lady'. She horseraces in Buenos Aires, gains social position by loveless marriage to bankrupt Colton, and even performs in an opera. But when she encounters Carrington again, he's become the Earl of Stratton!