Sean "Diddy" Combs and his ex-girlfriend Kim Porter have had a tumultuous relationship since they started dating in the 1990s. (Remember when Diddy was hooking up with Jennifer Lopez?) Kim called off their 10-year relationship for good in July 2007, but they still have a son and twin baby girls together, so we wouldn't be surprised if they decided to take the plunge someday. Lester Cohen/WireImage.com - July 27, 2006
On-Again/Off-Again Celebrity Couples
Celebrities and their on-again/off-again relationships.