Vintage photos show what it was like to party alongside celebs\, royals\, and politicians on Jackie and Aristotle Onassis\' iconic yacht in its glamorous heyday

Jackie O's yacht parties were always invite-only.

Already a national name as former First Lady of the United States - and a legendary fashion icon - Jacqueline Kennedy gained media attention when she started dating wealthy shipping tycoon Aristotle Onassis. She began frequenting his superyacht with her children in the 1960s.

Aristotle Onassis purchased the vessel - originally a convoy escort called the Stormont - at scrap value, turning it into his floating mansion, which he called the Christina. For almost two decades, the yacht served as a meeting place, a reception hall, and the "world's most exclusive bar."

Aristotle Onassis and Jackie Kennedy Onassis regularly entertained an elite social group aboard their legendary superyacht following their wedding in 1968. The reception - like so many other events - was held aboard the Christina.

Notable guests over the years included a long list of Hollywood stars, from Elizabeth Taylor to Marilyn Monroe. Frank Sinatra, John Wayne, and Richard Burton also visited, alongside royalty such as the Prince and Princess of Monaco.

Today, the luxury yacht is available to rent for $100,000 per day.

Keep reading for a look at some of the exclusive gatherings the Onassis hosted aboard the Christina, from a lunch with Winston Churchill to Jackie O's own wedding.