17. Jon Hamm and Jennifer Westfeldt
Jon Hamm, the actor, director, television producer and all-around heartthrob is best known for playing advertising executive Don Draper in theTV series Mad Men. He and actress and screenwriter, Jennifer Westfeldt are known to be together since 1997.
The two actors were a solid couple for almost 20 years, but they ended things in 2015. Jon had previously said they would not get married unless they had children. The two never had children, but they did adopt a dog together. No word on who got custody. There are rumors though that the two have started to recently see each other again. Patching things up perhaps?