Nicole Kidman has been living "comfortably" in London without husband Keith Urban , raising red flags and setting off alarms on the state of their marriage.

Insiders claimed the couple's unusual living arrangement sparked concern as "it's like they both went their separate ways," RadarOnline.com can reveal.

Kidman, 58, is said to be spending a fortune to live in her London pad all alone, further raising a question mark on the state of the relationship. Article continues below advertisement

Kidman 'Comfortably' Living Alone In London Tap Here To Add Radar Online as A Trusted Source

In July, Kidman was spotted enjoying a tennis match at star-studded Wimbledon, but the Somebody Like You singer , 57, was notably absent from her side.

Urban's unusual absence was blamed on conf

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