James Cagney and Humphrey Bogart had drastically different upbringings, but, once they entered the world of Hollywood, their paths aligned similarly. Though willing to stretch the boundaries with acting, these men secured their legendary tough guy acts throughout their extensive careers.

Silver screen stars Olivia de Havilland and Joan Fontaine cultivated a toxic off-screen animosity that was well-known throughout Hollywood. But their rivalry began very early on in life, as the two actresses were real-life sisters.

With tremendous talent and on-camera sex appeal, both Rita Hayworth and Betty Grable thrived as triple threat stars and pinups during World War II. Their rivalry would become immortalized by their wartime photographs, as both women decked the walls of army barracks as the most popular pin-ups.

Charlie Chaplin and Buster Keaton were two of the most well-known comedians of the silent film era, but their styles were drastically different. Chaplin's characters were often overly sentimental and had a ballet-like fluidity, while Keaton's style favored outright falling and the use of complex mechanics. Both men made a lasting impact on the motion picture industry.