After nearly 20 years of marriage, Nicole Kidman and Keith Urban have officially pulled the trigger on a divorce, and speculation is intensifying over what led to the high-profile breakup.

Kidman filed for divorce from Urban on Tuesday (US time), citing irreconcilable differences, just one day after it was confirmed the couple had separated earlier in the US summer.

The filing marks the end of a relationship that began in 2005 and produced two daughters, Sunday Rose and Faith Margaret.

While the couple has remained publicly silent, sources close to both stars suggest the split was far from sudden, hinting that Urban was dealing with some personal struggles behind the scenes.

“He’s been going through some stuff,” a source within Urban’s circle revealed to People .

A separate source c

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