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Socialite Jocelyn Wildenstein poses for a picture February 10, 1999 in New York City. Wildenstein is the wife of wealthy art dealer Alec Wildenstein.
Jocelyn Wildenstein.Evan Agostini/Liasion/Getty

Swiss socialite Jocelyn Wildenstein, known for her extensive and extreme plastic surgeries and high-profile divorce from a billionaire art dealer, died on Dec. 31. She was 84.

Her partner, Lloyd Klein, confirmed to PEOPLE that she died in her sleep while taking a nap.

Jocelyn was born Jocelyne Périsset in Lausanne, Switzerland, in 1940. In 1977, she eloped with Alec Wildenstein. They shared two children, Diane and Alec Jr.

The couple made headlines with their 1997 divorce which saw Alec pay his ex-wife $2.5 billion, as well as $100 million annually to settle. It was finalized two years later.

She and Klein had been together since 2003.