1: Kevin Costner reveals shocking truth about "Horizon" at Cannes.

2: Uncover Costner's surprising admission about "Horizon" at Cannes.

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5: Costner drops jaws with unexpected Cannes reveal about "Horizon."

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7: The Cannes revelation that has everyone talking about Costner.

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9: Discover the unbelievable truth Costner shared about "Horizon" at Cannes.