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Kristin Cavallari's romance with TikTok star Mark Estes has seemingly become serious after the reality TV star shared a photo of her new boyfriend spending time with her son.

Cavallari, 37, posted a photo of Estes, 24, and her son walking with a simple white heart. 

The fashion designer previously revealed Estes actually met her kids on their first date, which occurred the day before Valentine's Day.

"We were making out in my driveway. I felt like I was in high school," Cavallari revealed on her podcast, "Let's Be Honest." "Then I walked in to my mom and Jaxon and was like, ‘Hi.’"

KRISTIN CAVALLARI IS ‘ALL IN’ WITH 24-YEAR-OLD BOYFRIEND, DOESN’T ‘GIVE A F---’ ABOUT AGE GAP

Kristin Cavallari's boyfriend Mark Estes with her son

Kristin Cavallari shares a photo of new boyfriend Mark Estes with her son. (Instagram: Kristin Cavallari)

"This is the real first guy I'd say they met," Cavallari noted. "My boys were so excited about him… You know what it is? I think more than anything, my kids are really excited for me. My kids really want to see me happy."

Cavallari and ex-husband Jay Cutler share three children; daughter Saylor, and sons Jaxon and Camden. The fashion designer is open with her kids about the fact she is dating – sometimes even getting their opinion.

"I tell them who I'm talking to or what's going on, and they have strong opinions about these guys," she previously told Entertainment Tonight.

Kristin Cavallari smiles at Jay Cutler

Jay Cutler and Kristin Cavallari announced their divorce in 2020. (Jake Giles Netter/E! Entertainment/NBCU Photo Bank/NBCUniversal via Getty Images)

Cutler and Cavallari announced their divorce in 2020.

"With great sadness, after 10 years together we have come to a loving conclusion to get a divorce," Cavallari wrote on social media at the time. "We have nothing but love and respect for one another and are deeply grateful for the years shared, memories made, and the children we are so proud of."

Since her split from the former Denver Broncos player, Cavallari has been romantically linked to a handful of famous men, including Chase Rice, "Bachelorette" alum Tyler Cameron and Morgan Wallen.

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Kristin Cavallari smiling with Mark Estes

Kristin Cavallari went Instagram official with Mark Estes last month, captioning her photo, "He makes me happy." (Kristin Cavallari Instagram)

Cavallari and Estes debuted their relationship in late February.

They each shared a post on social media with the other for the first time. The "Laguna Beach" star shared a photo with the former college football player and simply wrote, "He makes me happy."

Estes also shared a video on his own TikTok account, which boasts over 70,000 followers. The two shared a kiss and Estes wrote, "Ready to fall."

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Many fans were supportive in the comments, while others focused on the new couple's 13-year age gap.

"The hottest couple ever I can't," one user wrote.

"Oh she's in her cougar eraaaaaa," another added.

"Men date younger all the time… why is it a problem for women to do the same?" one user noted.

"Damn no wonder she doesn't post anything personal, people have SO much to say for no reason! She's happy, leave it at that!" another chimed in.

Kristin Cavallari in New York City

Kristin Cavallari has said she does not care about the backlash over the age gap with Mark Estes. (Photo by Gotham/GC Images via Getty Images)

According to Estes' Instagram profile, he currently resides in Nashville, Tennessee. He completed his final season of college football in November 2023, which included one redshirt season. The collegiate athlete played for Montana State University and Montana Tech.

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