Kevin Costner and his wife Christine Baumgartner are getting a divorce after 18 years of marriage. Here's a complete timeline of their relationship.

The Academy Award-winning director and actor was practicing his birdies and his bogeys ahead of starring as a golf prodigy in the 1996 romantic comedy when he and Baumgartner, who is 19 years his junior, were introduced. At the time, she was working as a model.

Costner, meanwhile, was married to his first wife, Cindy Silva, who he had met and wed while still in college.

During their 16-year marriage, they welcomed three children: Annie, 39, Lily, 36, and Joe, 35.

Upon the dissolution of their marriage in 1994, Costner had several other relationships before he and Baumgartner married.

He had a brief relationship with Bridget Rooney, with whom he fathered a son named Liam, 26, and also reportedly dated political activist Birgit Cunningham and supermodel Elle Macpherson.

The two began dating soon after they ran into each other, several years after their first encounter.

Speaking to People in 2003, Costner recalled: "We exchanged numbers, and I told her that I would — did she mind if I called her in two weeks. I did not realize that was like an insult to a woman."

According to the "Field of Dreams" actor, they called it quits for a time due to a difference of opinion when it came to having kids.

While Costner, already a dad of four, didn't want any more children, for Baumgartner, becoming a mom was a deal breaker.

Reflecting on their separation while chatting to Parade in 2008, Costner said: "For years, fear kept me from marrying Christine. Christine wanted a child, but I was afraid I couldn't be an effective father."

However, he said that he was able to quieten his worries to make their relationship work.

"I woke up and thought, 'Am I going to lose a beautiful woman who is willing to be with me to my very last breath because I am afraid to say yes to a child?'" he said.

"That's all it took," he said. "I decided that I was not going to miss out on love."

The couple married in a ceremony at the actor-director's sprawling 165-acre ranch just outside of Aspen, Colorado on September 25, 2004.

According to People, Costner arrived in a horse-drawn carriage while his bride made her journey to the riverside ceremony in a vintage green pickup truck.

CBS reported that there were over 300 guests in attendance, and People said that the guest list included Tim Allen and Don Johnson.

In the early 2000s, Baumgartner founded the label Cat Bag Couture, which makes designer laptop cases.

Speaking to the Denver Post in 2005, she said: "When I came up with some samples, I showed them to Kevin, and he said they were beautiful and amazing."

She continued: "He told me I should take it to the next step and he'd help me. I've always loved fashion and style, and if you can mix it with function, it's perfect."

First was their son Cayden, born in May 2007. At the time, Costner was 52 and expressed worries about being an older dad.

"I hope I have as much energy for Cayden as I had for my first," he told People, adding that he had fears that "someone [else] will raise him, meaning that my life will end prematurely."

"I won't get to coach him in what I think it is to be a man. I'd like to be the person that tells him about life."

Baumgartner then gave birth to their second son, Hayes, in February 2009. They welcomed their third child together, a daughter named Grace, in June 2010.

In an interview with People in June 2020, the "Bodyguard" actor spoke about what it was like to take a step back from acting while everything was shut down because of the COVID-19 pandemic.

"Our partnership has really come into focus about what we do for each other and how we deal with our family," he said of Baumgartner.

"Our house is like a river: You've just got to get into the flow of it. And whatever you thought it was going to be, maybe it still can, but it's going to have to work with what the day brings."

Costner won the award for best actor in a drama series for his performance as John Dutton in "Yellowstone" at this year's Golden Globes but was unable to attend the ceremony due to severe flooding at his home in Santa Barbara, California.

"Nobody's sadder than us that we can't be there at the Golden Globes," Costner said in an Instagram video posted before the awards show began. "Chris had a beautiful dress, I was looking forward to walking down the red carpet with her."

Elsewhere in his speech, he mentioned "how bad Chris wanted to support me," and explained that his wife had organized a last-minute viewing party for the family at home.

"She went out and bought me some gold and yellow and black and silver balloons, and so we're able to sit at the television and see what happens," Costner said.

A representative for Costner, 68, confirmed the news to the Los Angeles Times on Tuesday, which comes five months shy of the couple's 19th wedding anniversary.

A statement on behalf of the actor said: "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."

"We ask that his, Christine's, and their children's privacy be respected as they navigate this difficult time," the rep added.

TMZ reported that Costner has hired celebrity divorce attorney Laura Wasser, who recently represented Kim Kardashian in her divorce from Ye, and has helped countless other A-listers reach divorce settlements over the years.

According to the outlet, Baumgartner has asked for joint custody of their three kids who are now 15, 14, and 12. Costner responded to the petition, also requesting joint custody of the children.

The news comes amid some drama in Costner's professional life too.

Since February, the future of his hit Paramount Network drama, "Yellowstone," has been brought into question amid rumors of a behind-the-scenes fallout between the actor and the show's creator Taylor Sheridan. He has yet to address the claims.