Kristin Cavallari and Mark Estes: Love knows no age!

Kristin Cavallari is shouting from the rooftops about her new romance — and doesn’t “give a f–k” about the 13-year age gap in her relationship.

During Tuesday’s episode of her “Let’s Be Honest” podcast, the “Hills” alum, 37, said she’s “all in” with her 24-year-old boyfriend Mark Estes.

“The age thing was a hangup for me, at first. Now, I don’t give a f–k,” she said of the pair’s age difference. “And I’m all in with this guy.”

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Kristin Cavallari says she doesn’t “give a f–k” about the 13-year age gap in her relationship. kristincavallari/Instagram

“I don’t actually care what anyone else thinks. And I do think my entire career has prepped me for this moment because when this news came out, it’s the first time in my entire life I 100% haven’t given a s–t what anybody thinks,” she added.

The mom of three — who refers to her new beau as “Montana” as a nod to his social media handle “Montana Boyz” — said those around her noticed a positive difference since the romance kickstarted.

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“I know that I’m happy. I know how Montana really is. I know what this is... My mom is noticing a difference in me. And that’s what matters,” she explained.

“Now to like, really just be standing in this truth, and like knowing how happy I am, nothing that anyone could say right now is going to rock it for me.”

Elsewhere in the episode, Cavallari revealed that Estes met her three kids before their first date on Feb. 13.

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The “Hills” alum, 37, said she’s “all in” with her 24-year-old boyfriend Mark Estes. kristincavallari/Instagram

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“[He] came and picked me up and he met my kids,” she told her podcast co-host, Justin Anderson. “He actually met my mom too because my mom was babysitting my kids, so it just really threw him in the mix.”

“This is the real first guy I’d say they’ve met,” she pointed out.

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Cavallari revealed that her beau met her three kids before their first date on Feb. 13. Instagram/@markestes

Cavallari — who shares Camden, 11, Jaxon, 9, and Saylor, 8 with ex-husband Jay Cutler — went on, “When [Estes] came to pick me up, the boys were like, ‘Can I show you my room?’ [Estes] is upstairs with my kids seeing their room. The boys were so excited about him.”

“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].”