3. Marilyn MonroeMarilyn Monroe met the president in February 1962, when British actor Peter Lawford—JFK's brother-in-law—invited the star to a dinner party in honor of the president.
Lawford was also responsible for organizing the 1962 Madison Square Garden fundraiser for JFK, where Monroe gave her iconic performance of “Happy Birthday, Mr. President.” The sultry performance fueled rumors of an affair between the movie star and the president that still live on today.