Kristin Cavallari, 37, packs on PDA with new boyfriend Mark Estes, 24, as she makes her 'country' debut on his popular Montana Boyz TikTok... after a bikini-filled romp with the model

Kristin Cavallari's romance with her new boyfriend Mark Estes is heating up. The former Laguna Beach star, 37, popped up in a fun video on the 24-year-old model's joint TikTok, the Montana Boyz, alongside his buddies on Friday, just three days after she revealed their relationship. In the short clip, the Montana Boyz - Estes, Kaleb Campbell Winterburn and Kade Wilcox - lip-sync to Jason Aldean's 2009 hit She's Country as they appear to introduce Kristin as part of their posse. Kristin Cavallari popped up in a fun video on the 24-year-old model's joint TikTok, the Montana Boyz, alongside his buddies on Friday, just three days after she revealed their relationship In the short clip, the Montana Boyz - Estes, Kaleb Campbell Winterburn and Kade Wilcox - lip-sync to Jason Aldean's 2009 hit She's Country as they appear to introduce Kristin as part of their posse Kristin's debut on the Montana Boyz page comes after she shared a bikini-filled romp with Mark on his personal TikTok. Kristin's debut on the Montana Boyz page comes after she shared a bikini-filled romp with Mark on his personal TikTok Rocking a green two-piece, Kristin jumped into the muscular arms of her new beau as they frolicked by the side of a pool The adorable couple packed on the PDA while the country song Goodnight by Gloriana played in the background Montana Boyz is a TikTok collective with nearly 460,000 followers 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; seen in 2015 'And I've had a lot of fun in the last few years, just really focusing on my friends and getting to hang out with my friends again, because I didn't get to do that for a long time.'