She died yesterday at her Beverly Hills home, her family announced, according to The Hollywood Reporter.
Their youngest son, musician Ricci Martin, died earlier this month.
Born Dorothy Jean Biegger on March 27, 1927, in Coral Gables, Florida, she went by Jeanne when she began modeling in Miami. She was voted Orange Bowl queen in 1947.
A year later, she came to the Beachcomber Club in Miami to see a New Year's Eve show starring Martin and Lewis.
Jeanne maintained she had never heard of either entertainer until that night.
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Matriarch of their large family, she gave birth to three of Dean's children while raising four more from his previous marriage.
For 20 years, they were viewed as one of Hollywood's happiest couples until on December 10, 1969, Jeanne issued a statement that they were parting ways.
Their break-up in 1969 caused nearly as much distress to Martin's fans as his professional split with partner Jerry Lewis had in 1956.
The divorce wasn't finalised until 1972. Dean Martin was wed once more, to Catherine Hawn, a hair-salon receptionist, and legally adopted her daughter, Sasha, but that union ended in 1976. Jeanne never remarried.
Eldest daughter Claudia Martin died of breast cancer in 2001. Their youngest son, musician Ricci Martin, died on August 3.
She is survived by son Craig Martin; daughters Gail Martin Downey, Deana Martin Griffeth and Gina Martin Romano, and 11 grandchildren. Funeral services will be private.
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