It's still not official yet, but it's really starting to look like Kevin Costner is leaving "Yellowstone."
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"Entertainment Tonight" heard from a "source close to the production" that he's done after Season 5. It's supposedly because of the drama between Costner and the show's co-creator Taylor Sheridan.
Speaking of Kevin . . . sources are telling TMZ that he was totally blindsided by his wife's divorce filing, and he's devastated.
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