Remember when Grace Kelly threw a lavish party exclusively for Scorpios?

Leah Dolan, CNN

You might assume that Grace Kelly’s 700-strong royal wedding ceremony to Prince Rainier III of Monaco in 1956 was the apex of her social legacy. But 13 years later, on Saturday November 15, 1969, the American film star-turned-princess threw herself one of the most peculiar and extravagant birthday parties in history.

“The Scorpion Ball,” Kelly’s horoscope-themed 40th birthday celebration, was held at the Hotel Hermitage in Monte-Carlo, Monaco.

The actor’s penchant for star signs had long been public knowledge: In 1956, Hollywood astrologer and horoscope columnist Carroll Righter was photographed visiting Kelly on the set during the filming of one of her last films, “The Swan.” Shortly after her engagement to Rainier, Righter dedicated one of his columns in the Chicago Tribune to championing the pair’s astrological compatibility, providing details of Kelly’s horoscope over “the last several years.” When Righter died in 1988, his obituary listed the Princess of Monaco as one of his many celebrity clients.

Centered around the eighth astrological sign, Kelly’s celebration included a few iron-clad ground rules: The first, a strictly Scorpio-only guest list. Attendees included Swedish actor and model Hjördis Paulina Genberg (born November 10, 1919), Italian actor Virna Lisi (born November 8, 1936), and American movie star Rock Hudson (born November 17, 1925). Mercifully, spouses of Scorpios were also permitted, as were Kelly’s family members.

Elizabeth Taylor was one such guest whose attendance was justified through marriage. The famous Pisces was also the wife of Welsh actor Richard Burton, born November 10, 1925. Taylor did not take her acceptance into the event lightly, and arrived in a glamorous black Tiziani cloak embellished with two diamanté scorpions on the front and one on the hood. Years later, the evening cape fetched $60,000 when it was auctioned by Christie’s in 2011.

As well as mandating a dress code of red and black for her guests — the color palette most associated with the scorpio sign — waiters at Kelly’s party wore 18th century-style powder wigs, velvet red suits embroidered with sequin stars, in-keeping with the celestial theme, and carried silver candelabras with red candles.

Kelly herself wore a black velvet off-the-shoulder Balenciaga gown with two black rosettes under each collarbone from the house’s Fall-Winter 1966 couture collection. She adorned the dress further with two ruby brooches set in diamonds — detachable flourishes from Kelly’s wedding present from Rainier, the Cartier Bains de Mer tiara.

Lining the walls of the Hotel Hermitage were portraits of other famous Scorpios, from Edgar Allen Poe to Marie Antoinette. The meticulously planned event was topped off with a gigantic fuschia cake, reportedly weighing in at 166 pounds, decorated with an ominous ring of golden scorpions as well as a giant version of the arachnid. The cake was apparently so enormous that it had to be cut in half in order to fit through the doors into the dining hall. It was her last birthday after all, or as Kelly is believed to have said on the night: “the last one I’ll admit to.”

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