KEITH & NICOLE: 6 YEARS
After exchanging "I dos" in their native Sydney in 2006, Urban and Kidman were ready to settle into domestic bliss. But just four months later, Urban shocked his bride by checking into rehab for alcohol addiction, though Kidman steadfastly stood by her man. "To see that kind of love in action, that's very moving and deeply inspiring," says the singer, who's been sober ever since. Today the couple, along with daughters Sunday, 4½, and Faith, 2, make their home in Nashville.