Credit: Lockerz.com Photo: Kim and Brielle are on a Road Trip!

It has come to our attention that we've got a birthday today on The Real Housewives of Atlanta. Kim Zolciak's oldest, Brielle, is turning 15 on February 25. Sigh, they grow up so fast! Here are five reasons why we love Kim's sassy mini-me.

5. She's Twitter-Riffic

If there's one thing we hate, it's a celeb who likes to keep us guessing. With Brielle, we always know what she's up to — girl loves to Tweet! Whether she's just saying "hi" or rejoicing that she "just remembered she has Chick-Fil-A in her locker," we love her endless stream of updates.

4. She Loves Her Mama

And who wouldn't? We can only imagine how fun it would be to have Kim Zolciak around all the time — like 24/7 quality live television! We adore their heart-to-heart mother-daughter talks, even if they are about breastfeeding. But what really melted our hearts was when Brielle told Kim she's so much more gorgeous than Angelina Jolie. Aww.

3. She's a Rockin' Cool Sister

It's easy to see how much Ariana worships her big sis, which is awesome considering what a great role model 'Elle is. Plus she has the best clothes ever — in a few years, Ariana will totally be raiding that closet. Poor Kroy, Jr., though... it's tough growing up with two smokin' hot older sisters.

2. She's Hilarious

Not only does Brielle always tell it like it is, she also tells it funny. Gotta love her always-dry, slightly sarcastic sense of humor. We wonder who she gets that from.

1. She's Smart

Let's face it: teenagers these days? Not necessarily the sharpest ever (case in point: Teen Mom and Jersey Shore.) Brielle, on the other hand, has got it going on. From her purity ring commitment to her stance against drugs, this lady's got a really good head on her shoulders. We wonder who she gets that from. No, seriously... who?