But when a teenage extra named Barbara Klein started "acting" like Hef's girlfriend during episodes of the series "Playboy After Dark," she soon found herself cast in the real-life role, too.
Her new beau suggested she change her name to Barbi Benton, and a '70s pop-culture icon was born.
Yes, Hef and the '70s were good to Barbi, but when she finally figured out he wasn't going to settle down and start a family, she left the man and the mansion and married real estate developer George Gradow.
After continuing to drop by shows like "CHi Ps" and "Fantasy Island," the mother of two turned her back on Hollywood to become an interior decorator.
Sondra Theodore Sonda Theodore was a Sunday school teacher turned Playmate of the Month (July 1977).
We get that they're twins, but we were still a little bummed out to hear that Hugh Hefner can't tell two of his three girlfriends apart.
Honestly, if you look quickly at a photo of Hef's latest batch of ladies, it's even a bit hard to distinguish 22-year-old Crystal Harris from the 19-year-old Shannon sisters.