Kevin Costner & his wife Christine

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Kevin Costner’s wife Christine files for divorce after 18 years of marriage. ‘Yellowstone’ star Kevin Costner and estranged wife Christine have three children together.

Kevin Costner and wife Christine are divorcing.

The “Yellowstone” star’s representative confirmed to Fox News Digital that the couple, who have been married for 18 years, are ending their relationship.

“It is with great sadness that circumstances beyond his control have transpired which have resulted in Mr. Costner having to participate in a dissolution of marriage action,” Costner’s rep said.

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“We ask that his, Christine’s and their children’s privacy be respected as they navigate this difficult time.”

Kevin Costner’s wife is pulling the plug on their marriage … we’ve learned she just filed for divorce.

The actor’s wife, Christine Costner, filed Monday to end their 18-year marriage. It’s unclear what led to the split. Christine cited the usual “irreconcilable differences.”

Watch as flight attendant bully Jessie James Decker Pregnant Sister Clean Kids Mess on plane

Kevin’s rep tells TMZ, “It is with great sadness that circumstances beyond his control have transpired which have resulted in Mr. Costner having to participate in a dissolution of marriage action.” The rep went on … “We ask that his, Christine’s and their children’s privacy be respected as they navigate this difficult time.”

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Kevin Costner & his wife Christine

The “Yellowstone” star and his estranged wife share 3 children — ages 12, 14 and 15.

We’ve learned Christine is asking for joint custody of the kids. Kevin filed his response Tuesday, in which he also asks for joint custody.

Christine is not asking for spousal support. Kevin’s response, filed by disso-queen Laura Wasser, says “Spousal support to be payable to petitioner pursuant to the terms of the parties’ Premarital Agreement.” In other words, there’s a prenup.