Two kids, a breakup and a recent relapse: Kristen Bell and Dax Shepard's 13-year relationship.

Kristen Bell and Dax Shepard are undoubtedly one of Hollywood's most-loved couples.

They have been together for 18 years, married for 11 and share two daughters, aged nine and eleven

But the first time the actors met in 2007, there were no sparks.

Watch: All the best moments from Kristen Bell and Dax Shepard. Post continues below.

"I had just gotten out of a long-term relationship like two months prior [with ex-fiancé Kevin Mann] and in retrospect, I realised [Shepard] had just gotten out of a long relationship," Bell told Willie Geist on Sunday Today.

"We were sitting at a table. The only thing I remember is that he talked so much. I was like, 'This guy can ta-alk!' And then I didn't know who he was... maybe one of the guys from Jackass or something."

"There were no sparks whatsoever," she added. "None."

Two weeks later, they met again at a Los Angeles Kings-Detroit Red Wings hockey game. (Bell and Shepard are both Red Wings fans and from Detroit.)

"We... started to flirt, left and then a day after that I get a text that says, 'Hi, this is Dax. I violated your privacy and got your number from Shawna. How do you feel about that?'" the Frozen star recalled on Sunday Today.

"And I was like, 'Excuse me? You sound stimulating.'"

Soon after, they were dating.

View this post on Instagram

A post shared by Dax Shepard (@daxshepard) on Jan 15, 2017 at 2:59pm PST

But after three months together, the couple briefly called it quits.

"We were dating for about three months, and I already knew that I was in love with him and he was hesitant because he knew he was still dating other people," Bell told Popsugar years later.

"He sat me down and said, 'I can’t have this right now. I think you’re wonderful, but I am still dating other people.' And then I, like, liquefied and fell to the ground, but I felt incredibly respected that he had the balls to tell me we weren’t in the same place."

Shepard quickly realised that he made a mistake.

"He called me and he was like, 'I don’t know what I was thinking. I was dating someone else, but they’re just not as interesting as you, and I don’t know what I’m doing,' and he came back. But I still always remind him of when he broke up with me."

"All the things I'd done were terrifying to her."

During their first year of dating, Shepard struggled with their relationship. Despite coming from the same city, the actors came from very different backgrounds. The Parenthood star has battled addiction since the age of 18 and previously abused cocaine and alcohol.

"Kristen’s a good girl. She grew up very Christian, went straight to college, did great in school and started work immediately. She’s charitable and philanthropic and rescues dogs," he told People.

"All the things I’d done were terrifying to her, and she had a hard time believing I would ever be able to stay married and monogamous and a father and all those things. For the first year-and-a-half we were together, that was what we battled over almost weekly."

In 2009, the couple appeared in the rom-com When In Rome together.

Later that year, in December, Shepard proposed.

Initially, Shepard hadn't wanted to get married. But after he realised how important it was to Bell, he changed his mind.

"He has a great argument that the state having a piece of paper doesn’t mean he’s going to be nice to me and by my side for the rest of my life," Bell told USA Today. "[Instead] that is going to be evidenced by how we treat each other and the commitment that we make.

"I had surrendered, like, 'Okay, well, I’m never going to get any sort of traditional marriage out of this, and that’s okay because I trust him."

"Forget the tradition or history of marriage as a concept," Shepard said speaking to Bell. "You knowing I was doing something that I didn’t want to do because I loved you was a big sign for you."

In 2012, the couple starred in another film together, Hit and Run. Shepard directed, wrote and produced it.

In January 2013, Bell announced they were expecting their first child, by debuting her baby bump at the Golden Globes. On March 28, 2013, the couple welcomed their first child, Lincoln.

View this post on Instagram

Going through old pictures😊😊😊👶👶👶

A post shared by kristen bell (@kristenanniebell) on May 6, 2020 at 11:58am PDT

Lincoln Bell Shepard is here. She has mom's beauty and dad's obsession with breasts. Hooray!!!

— dax shepard (@daxshepard) March 28, 2013

In October 2013, a few months after same-sex marriage was legalised, the couple wed at the Beverly Hills Courthouse. They'd waited for the law to pass, in solidarity with the LGBTQI community.

.@daxshepard1 will you marry me? Xo #marriageequality #loveislove”

— Kristen Bell (@KristenBell) June 26, 2013