Bette Davis and Joan Crawford
The Golden Age is the most iconic age of Hollywood. During that time, Bette Davis and Joan Crawford created the most infamous feud of all time. Their feud started with a love triangle. Davis was with actor Franchot Tone while they filmed Dangerous together. Crawford decided to invite him over for dinner one night when she greeted him nude at the door. Obviously, their relationship took off from there.
Davis called Crawford a "shallow mannequin" and, in response, Crawford said that Davis "looks like she's never had a happy day, or night, in her life." They were two of the most famous actors back in the day, so they ended up working together a handful of times despite their intense rivalry.