The Run of His Life: The People vs. O. J. Simpson by Jeffrey Toobin:
The four Brown sisters all looked and sounded alike, and they reflected the values of their moneyed Orange County upbringing. All four had breast implants, but not one had a college degree. The two oldest sisters, Denise and Nicole, the brunette and the blonde, came closest to embodying a certain California ideal: lithe, athletic, out for a good time, each a homecoming princess at Dana Point High School. Denise graduated in 1975 and became, briefly, a New York model. Nicole graduated on May 20, 1977, and met O.J. Simpson three weeks later.