Although Gene Simmons and Cher had an open relationship, she drew the line at her boyfriend dating her best friend. According to InStyle, Simmons didn't know what to get Cher for Christmas in 1979 and Cher told him to contact her best friend Diana Ross, who was in New York City at the time. The two hit it off so well, they ended up living together shortly thereafter. In a 1980 interview with People, Simmons claimed that Cher was okay with his relationship with Ross and even came out to see him rehearse with his band KISS with her friend. "She's turned into our biggest fan," the bassist stated at the time.
In a later interview with Howie Mandel, Simmons revealed how Cher found out about his affair with Ross. "I bought a place for Cher in New York on Fifth Avenue, and she had her designer design it," he shared. He went on to say that by the time the apartment was ready, Cher noticed that he wasn't staying there and added, "I was staying a few blocks away with Diana at her place. So, she said, 'What's going on?'"
Simmons and Ross dated for about four years and he called their relationship "a combination of joys," in his memoir, "Kiss and Make-up" (via InStyle). However, the couple soon fizzled out after the rocker started partying at the Playboy Mansion, where he would go on to find his future wife.
