Nicole’s Non-Negotiable Marriage Ultimatum To Keith

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 MOVIE beauty Nicole Kidman has stunned country crooner hubby Keith Urban with a shocking ultimatum – get off the road or out of this marriage, say sources.

But “American Idol” judge Keith is said to be balking at Nicole’s demand, and now their nearly eight-year marriage threatens to end in a $175 million divorce.

“Nicole wants Keith to take a full year off to prove he’s still invested in their marriage,” a friend told The ENQUIRER. “She told him to back off scheduling any concerts in 2015. If not, Nicole says Keith can hit the highway – and stay there!”

Pals say that the celebrity union has been stressed by their careers, which keep them far apart for long stretches of time and have caused trust issues. So the Oscar-winning beauty put her foot down when Keith recently extended his current tour through September.

BUT “He’s bucking her demand,” said another source. “Neither is backing down, and it’s starting to look like the end.”

The couple, both Australians who will turn 47 this year, have long struggled to keep their marriage on an even keel, sources say.

Four months after they tied the knot in June 2006, “Cold Mountain” star Nicole stood by Keith when he checked into rehab for cocaine and booze addictions. But she remains terrified he’ll backslide into his bad habits on the road, insiders say.

And while Nicole gushes over their marriage and daughters, Sunday, 5, and Faith, 3, in public, it’s a different story behind closed doors, revealed the source. “In private, it’s a never-ending war between them,” confided the source. “Nicole’s fears that he’ll go back to drinking and drugging cause Keith to explode in anger.”

Jealousy is also tearing the couple apart – with an Australian maga­zine reporting their marriage was rocked by Keith’s “flirt-fest” with fellow “Idol” judge Jennifer Lopez during the show’s finale.

“Their most recent display of affection for each other wasn’t helped by the fact that J.Lo was dressed in a barely-there lace mini-dress and happily laughed along with her hunky co-star,” said the report.

Meanwhile, Keith allegedly flew into a rage when Nicole signed on to film another movie with handsome English actor Colin Firth, her love interest in “The Railway Man.”

Keith is also said to be furious over Nicole’s repeated references to her ex-hubby Tom Cruise, telling her: “I’m sick and tired of hearing about Tom Cruise! Never mention his name around me again!”

The difference between their fortunes – Nicole is worth $130 million to Keith’s $45 million – triggers additional problems, sources say. “Keith believes Nicole is a much bigger star than he’ll ever be,” said the friend. “And he’s afraid that if he quits touring, his fans will forget him. So now Keith is at a crossroads. Does he cave in to Nicole’s ultimatum and risk becoming a has-been or hit the road despite her threats? But Nicole insists that either Keith take a break from touring or their marriage ends. She’s made it very clear there’s no negotiating.”