COWBOY COSTNER GORES EX IN $145M RANGE WAR

Claims she’s ignoring prenup and squatting in his seaside mansion

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HOLLYWOOD cowboy Kevin Costner charges estranged wife Christine Baumgartner won’t vamoose from their marital mansion in California in violation of their iron-clad prenup — because the greedy gal is trying to shake him down for more dough in their $145 million divorce!

Now, sources snitch the former Yellowstone stud is saddling up for a mudslinging showdown!

The Dances with Wolves star, 68, fired off legal documents asking a judge to boot the beauty from his Carpinteria crib after she failed to move out within their agreement’s 30-day window.