Christine has filed for divorce, ending her 18-year marriage with Kevin Costner

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The reason for the split is unknown

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Kevin's spokesperson expressed sadness and asked for privacy for the family

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The couple has three children, ages 12, 14, and 15

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Christine is asking for joint custody of the children, which Kevin has agreed to

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The divorce proceedings appear to be amicable, and Christine is not seeking spousal support

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Kevin is being represented by high-profile divorce lawyer Laura Wasser

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The news of the divorce is surprising, as the couple has been together for nearly 20 years

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