The shocking split between long-time celebrity love birds Nicole Kidman and Keith Urban could take another surprise twist due to a bizarre legal quirk.

When the megastars got hitched back in 2006, they signed a prenuptial agreement to protect their assets, and while the pair have not officially announced a divorce yet, all signs point to the relationship heading down that path.

If that were to be the outcome then it could trigger the unusual ‘cocaine’ clause written in their marital contract — making Urban, 57, an even richer man.

The cocaine clause means if Urban stayed clean from drug and alcohol, the four time Grammy Award winner will receive more than $900,000 from Kidman, 58, for every year they were married, adding up to more than $17 million.

Despite being vocal about his sobrie

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