November 28, 1938 - September 4, 1999 (age 60)
Joni Mattis was an American Playboy model and actress. She was born on November 28, 1938 in Chicago, Illinois, United States. She was chosen as Playboy's Playmate of the Month in November 1960. Joni was 21 when she became a Playmate.
Her real name is Joan E. Mattis. Joni was the lightest Playmate of the Month ever. She is known for her work on Playboy After Dark (1969) and Playboy's Penthouse (1959).