Wildenstein was famed for her extensive plastic surgeries which led to her ‘cat-like’ appearance, as well as her high-profile divorce from billionaire art dealer Alec Wildenstein in 1999.
Her partner Lloyd Klein reportedly confirmed her death to news agency AFP with a statement.
He said that he was “saddened to announce” the socialite’s death from a pulmonary embolism on Tuesday at a Parisian palace.
Klein began dating Wildenstein in 2003, and the couple got engaged 14 years later.
The couple had recently been spotted out in Paris together.
Wildenstein last shared a video of her and Klein on December 23 walking hand-in-hand just days before Christmas.
Previously, the socialite was married to billionaire Alec N Wildenstein, with the duo eloping in Las Vegas in 1978.
Their high-profile divorce in 1999 left Jocelyn a billionaire.