Which American President did Marilyn Monroe allegedly have an affair with during his presidency?

Marilyn Monroe was one of the most glamorous and sought-after stars of her time. John F. Kennedy was, well, the president of the United States. After Marilyn performed a steamy rendition of "Happy Birthday" at the commander-in-chief's 45th birthday party in May 1962, rumors of an affair were propelled — and those rumors have persisted throughout history, even though details of an ongoing relationship between the two are actually pretty scarce.

The first time Marilyn and JFK were confirmed to have been at the same place at the same time was at the April in Paris Ball on April 11, 1957, at the Waldorf-Astoria Hotel in NYC; Marilyn was there with her then-husband, playwright Arthur Miller, while John attended with his wife, Jackie, and his sister, Eunice Kennedy Shriver. Both of them were photographed extensively throughout the night, but no meeting between them took place at that event. It's more likely that John and Marilyn first met at a dinner party hosted by actor Peter Lawford in 1961. Peter was married to John's sister Patricia, whom Marilyn became friends with while filming Let's Make Love. They also had a mutual friend in Frank Sinatra, who was a member of the Rat Pack with Peter and who briefly dated Marilyn after her divorce from Arthur Miller.