Getty / Dale Whiteside Composite

One of Keith Urban 's fans -- who looks a lot like the country star -- says he got the inside track on the Nicole Kidman divorce weeks before the world did ... and he got it straight from the singing horse's mouth.

Dale Whiteside tells TMZ ... he had the most bizarre interaction with Keith during a September meet-and-greet at the singer's Saskatoon, Canada stop on his "High and Alive" world tour. Dale Whiteside

Dale strongly resembles Keith, and he says the musician was blown away when they connected prior to the Sept. 15 concert, and while they chopped it up ... that's when Keith strongly hinted at the big D.

He says he was telling Keith about a moment at a music festival, when a couple mistook him for KU ... but they realized he couldn’t r

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