Theirs was the relationship that almost didn't happen. When they met in the early '90s, both were married to other people. Six years and two divorces later, Gill and Grant swapped vows in Nashville in 2000. Since then, the pair has successfully blended families – they have four kids between them, and another one together – and resumed their high-profile careers. [Their marriage], says Gill, is "a great fit. The compatibility is really pretty amazing, just the way we balance each other."