Kristin Cavallari, 37, and boyfriend Mark Estes, 24, cuddle and kiss in new PDA photos

Kristin Cavallari isn’t holding back from showing PDA with her new boyfriend, Mark Estes.

The “Hills” star couldn’t seem to keep her hands — or lips — off her tatted-up, much-younger beau in new photos shared to her Instagram Thursday.

In one saucy snap, Estes, 24, is seen with a cheeky grin on his face as he wraps his muscular arms around Cavallari, 37, who holds on tight and presses her body against his.

They looked smitten as they posed for photos together. kristincavallari/Instagram “Him,” she captioned the photo along with a white heart. markestes/Instagram

In another photo, the lovebirds are captured embracing in an intimate kiss in which Estes lovingly grabs Cavallari’s face as she touches his waist.

The “Laguna Beach” alum wore a white miniskirt and a baby-pink tank top. She accessorized with a gold watch and a stack of delicate necklaces.

Meanwhile, the TikToker looked casual in a boxy gray T-shirt, jeans and a black trucker hat.

The pair started dating in February. TikTok/@markestes001 Cavallari immediately fell for him when she saw him on TikTok. Instagram/@markestes

“Him,” she captioned the post along with a white heart emoji.

Estes shared his own post Thursday with several PDA-filled photos of the couple alongside the caption, “Photo dump of my girl and I” with a red heart.

The duo are already quite serious, with Cavallari admitting earlier this month that Estes has already met her and her ex-husband Jay Cutler’s three kids: Camden, 11, Jaxon, 9, and Saylor, 8.

“‘Holy s–t, this is the hottest guy I’ve ever seen — in the world,'” she thought to herself when she first saw him. Instagram/@markestes The “Hills” alum wanted him to come on her podcast. kristincavallari/Instagram

“[He] came and picked me up, and he met my kids,” she said on her “Let’s Be Honest” podcast. “He actually met my mom, too, because my mom was babysitting my kids, so it just really threw him in the mix.”

She added, “This is the real first guy I’d say they’ve met.”

Cavallari said her sons have been extremely supportive of her new relationship.

They started chatting after the TikToker DMed her. Instagram/@markestes They went public with their love just days after their first date. markestes/Instagram

“My kids are really excited for me. My kids really want to see me happy, and I’ve been very good at separating my dating life from [them],” she said.

The “Very Cavallari” alum also divulged how she and Estes first connected.

“Back in, like, September [2023], I’m scrolling TikTok, and I stumble upon this boy group — I guess you can call them the Montana Boyz,” she recalled.

The pair have continued to show PDA since. markestes/Instagram The reality TV star is unbothered by their 12-year age gap. markestes/Instagram

As soon as she saw him in a video, she thought to herself, “‘Holy s–t, this is the hottest guy I’ve ever seen — in the world.’”

In a stroke of luck, the Montana Boyz ended up sending her a DM through their account, simply writing, “I love you.”

Cavallari replied by inviting the group — comprised of Estes, Kaleb Winterburn and Kade Cutterwilcox — on her podcast. But it wasn’t until three months later that she officially connected with Estes.

Estes has already met her three children. markestes001/TikTok Cavallari said that they are very serious and “full on.” kristincavallari/Instagram

“I was like, ‘Hey, I heard you guys are moving to Nashville,’ and then I asked which one I was talking to,” she shared. “And he said, ‘This is Mark responding,’ and I said, ‘Oh, good, you’re my favorite.’

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“We just kind of started talking from there. I still did not think anything would ever happen,” Cavallari added.

Estes is part of the Montana Boyz TikTok group. markestes001/TikTok A source confirmed to Page Six that she is “unfazed” by their age difference. markestes/Instagram

Cavallari debuted their relationship by going Instagram-official with the former college athlete just days after their first date in February.

Last month, an insider told Page Six exclusively that the couple is “unfazed” by their 12-year age gap.

“They’re two consenting adults who like each other, so who cares?” the insider said. “Everyone is entitled to their opinion, but Kristin and Mark aren’t paying attention to the noise.”

She shares her kids with ex-husband Jay Cutler. Todd Williamson Cavallari and Cutler share Camden, 11, Jaxon, 9, and Saylor, 8. Getty Images

Cavallari confirmed that she doesn’t “give a f–k” about their age difference and said they are “all in” on their relationship.

Estes was even seen bonding with her son just one month after their first date.

The reality star and the social media influencer were seen sweetly holding hands during a date night at Sugarfish in Beverly Hills, Calif., last weekend.