The New York Times confirmed her death at New York-Presbyterian/Columbia hospital, but did not report the exact cause of it.
Before her decades-long stint at Cosmo, the Arkansas native worked as an advertising copywriter and penned the ground-breaking 1962 book "Sex and the Single Girl."
"I never liked the looks of the life that was programmed for me -- ordinary, hillbilly and poor -- and I repudiated it from the time I was 7 years old," Brown wrote in her 1982 book "Having It All."
2014: The Year in Fashion [PHOTOS]
Kris and Bruce Jenner divorcing