As the popularity of the Max Fleischer Studios cartoon character Betty Boop was catching on in the early 1930s, the studio placed an ad in movie industry Trade Papers in October 1931, stating that Betty Boop combines the simplicity of Mary Brian, the subtlety of Norma Shearer, the fire of (Greta) Garbo, the sweetness of Joan Bennett, the allure of (Marlene) Dietrich.