Givenchy's partner, Philippe Venet, said the style icon died in his sleep at the home they shared outside Paris, according to The Guardian.
Givenchy fashion house, which Givenchy founded in 1952, confirmed the news Monday on its official Twitter account.
"The House of Givenchy is sad to report the passing of its founder Hubert de Givenchy, a major personality of the world of French Haute Couture and a gentleman who symbolized Parisian chic and elegance for more than a half a century. He will be greatly missed," the company said.
"He revolutionized international fashion with the timelessly stylish looks he created for Audrey Hepburn, his great friend and muse for over 40 years," Givenchy fashion house said, according to the Los Angeles Times.
"His work remains as relevant today as it was then."
Givenchy was 25 when he opened his design house in 1952, and met Hepburn the next year after she was cast in "Sabrina."
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He agreed to meet with her only because he thought he was dressing Katharine Hepburn, but developed a longtime friendship with the actress.
"Immediately we had this great sympathy together," the designer recalled of Hepburn, who died in 1993, in an interview with the Los Angeles Times in 1995.
Givenchy created pieces for Hepburn both on and off-screen, and won an Oscar in 1958 for his contributions to her movie "Funny Face."
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