Kristin Cavallari says she was “in love and obsessed” with boyfriend Mark Estes during their Bahamas vacation

“I’m in love. I’m obsessed. And I don’t even feel guilty about it,” Cavallari says while singing along to the lyrics to Rihanna and Casa Di’s remix in a new TikTok.

Kristin Cavallari feels love on vacation with her boyfriend Mark Estes.

In a new TikTok, Cavallari, 37, shared a series of videos of Estes, 24, while vacationing together in the Bahamas, set to the remix of “I’m in Love and I’m Obsessed” by Rihanna and Casa Di.

At the beginning of the clip Laguna beach Alum sings along to the lyrics of the hit: “I’m in love. I’m obsessed. And I don’t even feel guilty about it.”

Related: Who is Kristin Cavallari’s boyfriend? All about Montana Boyz TikToker Mark Estes

The video then shows Estes grilling in a tank top showing off his tattooed arms before ditching the shirt altogether in the second clip. The third was a sweet moment where he plays cards with one of Cavallari’s sons.

The Uncommon James founder also posted a series of photos on her Instagram account documenting her trip to the Bahamas with Estes and her three children – sons Camden, 11, and Jaxon, 10, and daughter Saylor, 8, whom she has with ex-husband Jay Cutler.

“Bahamas with my favorite people 🇧🇸 ☀️”, the hill “Alum” wrote in the caption alongside photos of her and Estes kissing on a boat, the family playing with wild boars on a beach, her and the kids relaxing on the same boat, and Cavallari sitting on Estes’ lap.

Estes is known as a member of the TikTok group “Montana Boyz,” an account where he and his friends post thirst traps and videos of themselves being cowboys in Montana. He recently finished his college football career with Montana Tech Orediggers in November 2023 and now splits his time between Montana and Nashville, where Cavallari lives.

“We love it. (We) support it. It’s been fun,” Montana Boyz member Kade Wilcox told PEOPLE in March, with Kaleb Winterburn adding, “It’s been fun meeting them and getting to know them and just everything about this whole world. It’s cool to see that.”

Related: Kristin Cavallari’s boyfriend Mark Estes calls her his ‘gorgeous girl’ during romantic treehouse trip

The guys now have 849,000 followers on their TikTok and said their account exploded following Estes and Cavallari’s public relationship.

“It all kind of happened at the right time, but since that happened, yeah, there’s been a complete shift,” Winterburn told PEOPLE. “I think more people are curious about what we’re doing – different age groups, everyone’s different. It just comes from her… what she’s done before. I think it’s sweet to see all these other people who are curious about what we’re trying to do.”

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Estes met Cavallari through the DMs and admitted that he accidentally sent the message from the Montana Boyz account instead of his own.

“Yeah, I thought I was on my own account and I DMed her,” Estes admitted. “We woke up the next day and (my boyfriend) was like, ‘Who DMed Kristin?’ I was like, ‘Oh, that was me.'”

Cavallari told the story on her podcast, with co-host Justin Anderson making fun of her for acting like a “little high school girl.”

“I get a direct message on Instagram from the Montana Boyz saying, ‘I love you.’ And I’m like, ‘Oh, my God!'” Cavallari recalls.

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