COWBOY COSTNER GORES EX IN $145M RANGE WAR

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

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.