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Kristin Cavallari Wears a Gold "M" Necklace amid Her Romance with Boyfriend Mark Estes

The 'Laguna Beach' alum debuted her relationship with the former football player in February

<p>Kristin Cavallari/Instagram</p> Kristin Cavallari shows of "M" necklace pendant on Instagram

Kristin Cavallari/Instagram

Kristin Cavallari shows of "M" necklace pendant on Instagram

Kristin Cavallari's jewelry is garnering the attention of her followers, just weeks after she revealed her new romance.

The Laguna Beach alum, 37, shared two selfies on Instagram Friday, in which she could be seen wearing a gold necklace that featured the letter "M."

The photos — which she also captioned "M" — were shared just over a week after she debuted her new relationship with Mark Estes, a 24-year-old former football player for Montana State University and Montana Tech.

And while fans speculated in Cavallari's comments section whether the new piece from her Uncommon James Jewelry line was a nod to her new partner, Estes himself tossed his own comment into the mix, writing "Smash" underneath Cavallari's latest snapshots.

Related: Kristin Cavallari Debuts New Relationship with 24-Year-Old Boyfriend Mark Estes

Cavallari first shared a photograph with her new partner on Instagram late last month. In the image, the pair smiled for a sunny selfie while enjoying their time in Los Cabos, Mexico.

Since then, Cavallari has filmed a few TikToks with Estes and has also been spotted returning from the vacation with him.

A source told PEOPLE last week that the pair have been “dating longer than people think,” and they've kept their romance "very private."

“They’re really happy together. He’s been so great to her and is just a really nice guy,” the insider added. “He’s not your typical 24-year-old. She’s having a great time and is living her best life with him.”

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<p>Kristin Cavallari/Instagram</p> Kristin Cavallari and Mark Estes pose for an image during Mexico vacation

Kristin Cavallari/Instagram

Kristin Cavallari and Mark Estes pose for an image during Mexico vacation

Cavallari recently uploaded a TikTok, where she poked fun at criticism over dating a younger man.

"When they’re all up in arms that im dating a 24 year old. Andddd?" she captioned a video, where she mouthed the words to a TikTok audio: "So what are you gonna do about it? Are you gonna arrest me? Are you gonna give me a ticket?"

<p>Kristin Cavallari/Instagram</p> Kristin Cavallari rocks "M" necklace in new Instagram selfie

Kristin Cavallari/Instagram

Kristin Cavallari rocks "M" necklace in new Instagram selfie

Related: Kristin Cavallari's Sexy Cabo Wardrobe: Everything She's Worn with New Boyfriend Mark Estes

Cavallari shares kids Camden, 11, Jaxon, 9, and Saylor, 8, with former NFL player Jay Cutler. The pair announced their divorce in April 2020 after a decade together.

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