Neil Diamond 's wife of 13 years, Katie McNeil Diamond , has revealed the secret to their happy marriage. Speaking with People at the New York premiere of Song Sung Blue – Hugh Jackman and Kate Hudson's musical biopic about the Neil Diamond tribute band, Lightning & Thunder – Katie, 55, gave some rare insights. "We're best friends, and we really support each other. We lift each other up, and through thick and thin, through sickness and health, we really live it. And I think that that's the secret," the talent manager said.

© Bruce Glikas/WireImage Katie McNeil Diamond noted that she and her husband, Neil Diamond, remain "best friends"

"And it's our 14th wedding anniversary coming up in April," she noted. Asked how the couple would mark the upcoming milestone, Katie replied: "I

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