Hollywood relationships are anything but stable, and there doesn't seem to be a formula for making Tinseltown love last. In 2006, we witnessed the short-marriage trend take off with stars such as Pam and Kid Rock splitting after less than four months of marital bliss. And even duos we thought would stay together forever, like Hollywood golden couple Reese and Ryan, divorced. Of course, there was that one pair we knew wouldn't make it — Britney and K-Fed topped our best celebrity split list. So, who will call it quits this year? We're keeping track of the celebrity divorces and celebrity breakups in 2007...

Plus: Check out our 2006 Celebrity Breakup Tracker.