12 Famous Open Relationships

Charlie Sheen may be the craziest celebrity ever to have a relationship with multiple women simultaneously, but he's certainly not the only celebrity to do so. The Daily Beast rounds up a dozen:

• Hugh Hefner: The Playboy founder's relationship record? Seven women at once. (He also, of course, dated identical twins.)
• Tilda Swinton: She's had a relationship with a Scottish artist for more than 10 years—they have twins together—but she's also been seeing a much-younger artist since 2004. They all "travel the world together," she said in 2008. "We are all a family."

• Simone de Beauvoir: The author of The Second Sex, widely credited with founding the women's movement, was in an open relationship with Jean-Paul Sartre for 51 years. Sartre once said it was "a good idea for us also to experience contingent love affairs."
• Andrei Kirilenko: The NBA star's wife allows him to sleep with another woman once per year.
• Mo'Nique: The Oscar-winning actress has said that her husband is allowed to have sex with another woman: "That's not a deal-breaker."

Click for the complete list.