5. Renee Zellweger and Kenny Chesney, 4 months
We're sad this one didn't work out, especially since the actress+country star formula is working out so well for Nicole Kidman and Keith Urban. It had all the right ingredients for a perfect marriage, too - they met at the Concert of Hope tsunami relief benefit, he came out with a song called "You Had Me From Hello" in her honor. They were married in May 2005 but petitioned for annulment in September.