Nicole Kidman 's marriage to Keith Urban has ended after 19 years, and those close to the couple now say the warning signs were visible months before the split became public, RadarOnline.com can reveal.

The Oscar-winning actor, 58, and the country singer, 57, are living apart, with Urban moving into his own residence in Nashville while continuing his High and Alive world tour.

Kidman has remained in Tennessee with their daughters, Sunday Rose, 17, and Faith Margaret, 14. Article continues below advertisement

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Sources suggest Kidman was "blindsided" by Urban's decision to split, though observers now point to a series of earlie

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