Nicole Kidman and Keith Urban quietly separated months before announcing their divorce – a relationship collapse insiders tell RadarOnline.com was long brewing beneath the immaculate surface of the pair's so-called "perfect couple" image.

The duo, who married in 2006 and share two daughters, Sunday Rose, 17, and Faith Margaret, 14, confirmed their split on September 29. But according to insiders, they had been living apart since the beginning of the summer. Article continues below advertisement

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Behind that timeline, insiders point to growing distance, shifting power in their careers and long stretches spent on oppo

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