Jackie Kennedy remains as an "icon" even years after her death. The public seemingly continues to praise and adore her for her beauty and elegance, as well as her efforts as the First Lady of the United States under John F. Kennedy's administration.

Reports regard her as one of the most popular U.S. First Ladies of all time. Some even continue to use her as a reference when comparing First Ladies of recent decades.

Despite the continued love and care from the public, Jackie O had her fair share of controversies during her time inside the White House. One of the most popular rows she experienced was about her husband's alleged extra-marital affairs, especially with Marilyn Monroe.

Cheat Sheet reported that among all the women, though, Jackie Kennedy only intervened when the "blonde bombshell" entered the picture. She allegedly "demanded" her husband to end his romantic affair with the American actress.

Writing for his book, Marilyn Monroe: The Private Life of a Public Icon, Charles Cassilo claimed that the former First Lady did not feel any threat toward the actress. She was, reportedly, sure of her "importance" in her husband's life.

Instead, she was more concerned about the "public disgrace" that the family would face if the alleged affair goes public. Moreover, Jackie O allegedly empathized with the celebrity's situation, adding that she knew how "deeply sensitive" and "troubled" Monroe was.

Cassilo noted that Jackie Kennedy "warned" John F. Kennedy, stating that his affair was "different" than the rest of his other links. She, also, urged the former U.S. President to "have some pity" on the actress.

The speculations over the reported affair have persisted to exist even in recent years. However, things have remained unconfirmed, considering that all parties involved already passed away.

Amid all the talks, though, Woman's Day, alongside other publications, previously reported that there is not much truth to the allegations about Marilyn Monroe and John F. Kennedy's affair. As pointed out, multiple sources attested that the affair was more of a "one night stand," by most accounts.

Historian Donald Spoto accounted for the few times that the pair likely encountered each other. In 1957, they both attended the Paris Ball at the Waldorf-Astoria Hotel in New York. However, sources said that they did not meet each other, adding that Jackie Kennedy was also present at the event.

In 1961, there were rumors alleging that the two personalities were at Peter Lawford's party in Santa Monica. While Kennedy was there, no one could confirm Monroe's attendance.

Many historians agree that the affair likely took place on March 24, 1962. They were both at Bing Crosby's home in Palm Springs for a party.

Sources claimed that John F. Kennedy and Marilyn Monroe engaged that night, which seemingly led to a one-time affair. Many also believe that this was the night when the former U.S. President asked the actress to sing at his birthday party, wherein the controversial birthday song took place.