COWBOY KEVIN LOSING FISTFUL OF DOLLARS!

Tightening his belt as divorce will cost him a new house

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YELLOWSTONE cowboy Kevin Y Costner is worth an estimated $250 million, but he's been pinching pennies fearing he'll have to give estranged wife Christine Baumgartner a huge chunk of his fortune when their divorce becomes official, tattle sources.

Although Christine inked a prenup before their 2004 wedding, "Costner's still worried sick about their pending divorce settlement and is watching his bank balance like a miser," spills an insider. "He knows he'll have to pay Christine a bundle. There's spousal support and child support to consider."