Christine Baumgartner beat Kevin Costner to the courtroom.

When the purse designer filed for divorce in Could after 18 years of marriage, the actor was reportedly “blindsided” as he had deliberate to file first.

The “Yellowstone” alum’s “lawyer was getting the paperwork drawn up” when his estranged spouse “sneak assault[ed] him and serve[d] him along with her personal set of divorce papers,” a supply instructed the US Solar over the weekend.

“Kevin was so shocked,” the insider added on Sunday, alleging that “Christine has since made him look horrible and has continued to take action.”

Nevertheless, a longtime pal instructed Web page Six final month that Costner was “surprised by Christine’s actions” as a result of he didn’t “need the divorce, and he would take her again.”

Web page Six has reached out to Costner’s rep for remark.

The Golden Globe winner and Baumgartner, 49, received married in 2004 and share three youngsters — Cayden, 16, Hayes, 14, and Grace, 13.

Costner filed for joint custody of the little ones final month in response to Baumgartner’s divorce submitting.

For extra Web page Six you like …

The duo’s divorce proceedings have since grown contentious, with Costner claiming in courtroom docs his companion has refused to maneuver out of their California dwelling and charged $95,000 on his bank card amid their breakup.

The Cat Bag Couture creator, for her half, accused the Oscar winner of telling their youngsters about their cut up by way of a 10-minute Zoom name.

“He insisted that he had the precise to inform them that we have been getting divorced ‘first’ and inform them privately ‘with out me current,” she alleged in courtroom paperwork obtained by Individuals.

Baumgartner, who’s requesting practically $250,000 in month-to-month little one assist funds, additionally known as out Costner’s allegedly extravagant spending in courtroom docs earlier this month, from $830,000 for presents to $449,000 for seaside membership charges.

The monetary revelations got here after Costner instructed the courts he wished his financial institution data stored personal on account of “undesirable and embarrassing world media consideration,” in addition to “irreparable” hurt by burglars.