Kristin Cavallari, 37, and new boyfriend Mark Estes are already discussing MARRIAGE as she finally enjoys a stable romance after her 'super messy' divorce from ex Jay Cutler - who has not yet been invited to meet the 24-year-old

Kristin Cavallari is serious about her relationship with younger TikTok star Mark Estes, according to sources who claim the reality TV personality has already discussed marriage and 'the possibility of forever' with her new partner.

The Laguna Beach star, 37, confirmed her relationship with the 24-year-old Montana Boyz star on Instagram in late February, and swiftly sparked a debate over their 13-year age gap.

However, the couple are brushing off the heat, with insiders claiming Mark has already bonded with her three children as she believes this will be a 'long-term' romance.

'Kristin is happy so people should let her be. She loves him,' a source told DailyMail.com exclusively. 'Her kids adore him, and he has taken on an active role in their lives.

'His age doesn't matter. If this was reversed and it was a 37-year-old man with a 24-year-old woman no one would bat an eye.'

Kristin Cavallari has already discussed marriage and 'the possibility of forever' with her new partner, Mark Estes

Kristin has children Camden, 11, Jaxon, nine, and Saylor, eight, with her ex-husband, former football player Jay Cutler.

The couple were married from 2013 until they split in April 2020, with their divorce finalized in June 2022. Kristin has since described their relationship as 'toxic.'

She moved on with comedian Jeff Dye, who was arrested for DUI in front of her in October 2023.

The insider continued: 'She had a super messy divorce with Jay and an unsuccessful relationship after that, which was more of a rebound than anything. 

'Jeff had major skeletons and was an alcoholic. She is glad he got sober, but it ended horribly.

'So far, she does not know of any skeletons in Mark's closet. She has done her research and so have her friends. 

'She wouldn't introduce him to her children if she didn't think long-term with him.'

They continued: 'Mark is hot husband material and whether or not it advances to this soon, of course they have discussed it. 

Kristin was previously married to Jay Cutler, a former football player, from 2013 until they split in April 2020, with their divorce finalized in June 2022 (pictured in 2015)

The former couple share three children Camden, 11, Jaxon, nine, and eight-year-old Saylor

'No couple goes into a serious relationship without discussing the possibility of forever. They both want forever.'

As for whether her new man will be crossing paths with her ex-husband, the source added: 'Mark has not met Jay and there is no reason for him to, yet. He of course knows as the kids talk about him and he sees the news. 

'But that is not something Kristin intends on mixing. He wouldn't be on the guest list at any wedding of hers.'

The MTV star previously stated that she had dismissed the 'red flags' she saw while engaged to Jay.

She canceled their planned wedding in 2011, two years before they tied the knot.

When they filed for divorce in April 2020, she cited 'irreconcilable differences' and 'inappropriate martial conduct' as grounds for the split.

The Laguna Beach star, 37, confirmed her relationship with the 24-year-old Montana Boyz star in late February

A source told DailyMail.com: 'Kristin is happy so people should let her be. She loves him'

Claims of infidelity were bandied about as the estranged couple were embroiled in a bitter custody battle over their children after Kristin filed for sole custody.

Jay fought back and eventually the pair agreed to be named 'joint primary residential parents,' each spending 182.5 days with the kids per year.

But Kristin is clearly smitten with her new man, telling her followers that he 'makes me happy' as she debuted him on Instagram earlier this year.

Mark only recently found fame as one third of The Montana Boyz, a group of TikTok stars comprising of him, Kaleb Campbell Winterburn and Kade Wilcox. 

The trio are originally from Montana but relocated to Nashville, Tennessee, where Kristin currently lives.

On a recent episode of her podcast, Let's Be Honest with Kristin Cavallari, Kristin revealed that the couple met online after Mark accidentally messaged her 'I love you' from the Montana Boyz's Instagram account.

Kristin later joked that it was a good thing 'because [she] never would have seen it' from his personal account.

'I [direct messaged] Kristin and I said "I love you" right off the bat,' Mark recalled, which Kristin noted had happened sometime in September or October 2023.

'I saw you guys on TikTok and I was like who the f*** are the Montana Boyz,' she recalled. 'Mark, specifically, I was like this guy is so hot, so I sent it to my best friend and I was like, "Look how hot this guy is."

The source continued: 'Mark is hot husband material and whether or not it advances to this soon, of course they have discussed it... They both want forever'

Kristin has made clear how smitten she is with Mark, telling her followers that he 'makes me happy' 

The pair has shared several snaps and videos from date nights and romantic getaways 

'We both were like, "Yeah, wow, he's amazing." Like three or four weeks later, I get a DM from the Montana Boyz that said "I love you," and I was like, "Oh my God! It's fate!"

'And then what do I do, because I have no chill? I was like, "I want to get you guys on my podcast." And then long story short, I put you guys in touch with my assistant, who booked you guys on the podcast and then she told me you guys were moving here and then I was like, "What the f***. This is crazy." 

She continued: 'Eventually I asked who I was talking to. And he said, "Mark," and I said, "Oh good, you're my favorite."'

After going public with their relationship, Kristin went on to make appearance on the group's popular TikTok account.

In the short clip, the Montana Boyz lip-sync to Jason Aldean's 2009 hit She's Country as they appear to introduce Kristin as part of their posse. 

Decked out in jeans and a T-shirt reading 'This Ain't My First Coors Rodeo,' Kristin flashes her megawatt smile before Mark hugs her from behind. 

Gaining more than one million views in less than six hours after being posted, the endearing video was captioned: 'Brother, she's country.'