Who Is Kj Biermann? What To Know About Kim Zolciak’s 15-year-old Son

So, you’ve heard the name KJ Biermann floating around, and your brain immediately went: “Wait, isn’t that Kim Zolciak’s kid? The one from Real Housewives of Atlanta?”

Bingo. You’ve got the right family tree. But KJ isn’t just a mini-me of his infamous mom. He’s a full-on, 15-year-old whirlwind of sports, TikTok, and teenage chaos.

Let’s break it down, shall we? Grab a snack, because this is going to be a fun ride.

Who exactly is KJ Biermann?

KJ stands for Kroy Jagger—yes, like the Rolling Stones legend. His full name is Kroy Jagger Biermann, and he was born on May 24, 2009.

He’s the second-oldest of Kim and Kroy Biermann’s four kids. But wait—he’s also part of a mega-blended family with Kim’s older daughters, Brielle and Ariana, from her previous relationship.

So, technically, he’s smack-dab in the middle of a house that looks like a reality show on steroids. And honestly? He handles it like a champ.

The Sports Fame: He’s Not Just a Reality TV Spawn

Here’s the thing: KJ isn’t famous just because his mom wore a wig on Bravo. The kid is a legitimate football star in the making.

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He plays quarterback for his high school team, and his highlight reels are wildly impressive. I’m talking spiral passes, lightning-fast footwork, and a confidence that screams, “My dad played in the NFL.”

His dad, Kroy Biermann, was a defensive end for the Atlanta Falcons. So, yeah, the football genes are strong with this one. Very strong.

The Social Media King (or at least a prince)

If you’re on TikTok, you’ve probably seen KJ doing dances, pranking his siblings, or just being a goofball. His account is a mix of sports, sarcasm, and sibling chaos.

He’s got a laid-back, “I’m too cool for school” vibe, but then he’ll post a video of him and his little brother, Kash, wrestling on the floor. It’s adorable, I swear.

And yes, he’s been caught in the Kim Zolciak “trying to film me while I’m eating” trap. We’ve all been there, KJ. We’ve all been there.

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What’s his relationship with his mom like?

Kim Zolciak is obsessed with her kids—and I mean that in the best, most loving way. She posts about KJ constantly, calling him her “little man” and hyping up his football games.

But don’t let the sappy captions fool you. KJ gives her serious teenage attitude. In one Instagram video, Kim tries to give him a kiss, and he literally ducks away like it’s a flying object. Classic 15-year-old behavior.

They bicker, they laugh, and they have that unbreakable mom-son bond that’s equal parts eye-rolls and “I love yous.” It’s honestly refreshing to see.

Does he like the spotlight?

KJ grew up on Don’t Be Tardy, Kim’s spin-off show. So cameras have been in his face since he was a toddler. But now? He seems selective about it.

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He’ll pose for a family photo, but he’s not chasing fame like some reality-TV kids. No, KJ is laser-focused on football, hanging with his friends, and being a normal-ish teenager.

Let’s be real: normal is relative when your mom once wore a diamond-encrusted “RHOA” tiara to the grocery store. But he pulls it off.

Fun facts that will make you smile

KJ is a competitive eater. Kim once said he can finish an entire large pizza by himself. At 15. That’s a growth spurt waiting to happen.

He’s also the youngest of the boys (Kash is 12, but KJ is tall for his age). So he’s the big brother who teaches Kash how to throw a football and also how to annoy their sisters.

And despite the chaos, he’s surprisingly grounded. No “I’m a star” attitude. Just a kid who loves his family, plays hard, and probably leaves his socks on the floor like every other teen.

Kim Zolciak's Sons Kash & KJ Are Already Taller Than She Is! See The

The Big Takeaway

KJ Biermann is not just “Kim Zolciak’s son.” He’s a rising athlete, a TikTok goofball, and a solid big brother. He’s navigating the wild world of adolescence with a reality-TV backdrop, and honestly? He’s doing great.

He’s proof that you can grow up in a house full of wigs, drama, and Bravo cameras, and still turn out to be a really cool, down-to-earth kid. You go, KJ.

A little uplifting goodbye

So next time you see KJ Biermann on your feed, don’t just roll your eyes at another “nepo baby.” Cheer him on. Because this kid is building his own legacy—one touchdown, one TikTok dance, one awkward mom-hug at a time.

And if he ever reads this? KJ, you’re doing amazing, sweetie. Keep throwing those spirals, ignoring your mom’s kisses, and being you. The world needs more 15-year-olds who aren’t afraid to be both a sports star and a total dork.

Now, go eat that pizza. You earned it.