Happy birthday, Mr. President! The iconic moment in American pop culture history when Marilyn Monroe serenaded our 35th president with a steamy rendition of "Happy Birthday" sparked rumors of an affair between the two — and those rumors have persisted throughout history, even though details of an ongoing relationship between the two are actually pretty scarce. Marilyn Monroe was, after all, one of the most glamorous and sought-after stars of her time, while John F. Kennedy was the President of the United States.
