From Hugh Hefner and Crystal Harris to Jesse James and Kat von D, see who else never made it down the aisle
Sheryl Crow and Lance Armstrong
After three years together (six months of which they were engaged), the couple announced their split. "We were up against her biological clock -- that pressure is what cracked it," Armstrong later said. But Crow didn't need him: she adopted a son in 2007 and another in 2010.
Credit: L. Cohen/WireImage