The Don't Be Tardy star's daughter turned 15 on Monday

Ariana Biermann, Kim Zolciak Biermann
Credit: Rick Diamond/Bravo/NBCU Photo Bank/Getty

When your mother is Kim Zolciak Biermann, you better be prepared for her to document much of your life on Snapchat, and no one knows that better than her daughter Ariana.

On Monday, Zolciak Biermann took to the social media app to film herself picking up Ariana from school on her 15th birthday — and it’s safe to say her daughter was in for quite the surprise.

Zolciak Biermann, 38, rolled up in the family SUV decked out with balloons, decorations and pink “Happy Birthday” messages scrawled across the car windows.

Music was blaring, and Ariana couldn’t hide her embarrassment as she hurried over to the car. Of course, Zolciak Biermann refused to let her in the car for a few minutes, roaring with laughter and filming the whole thing alongside her husband Kroy Biermann, 31.

“Not funny!” said Ariana once safely wedged between balloons inside the car — but that didn’t stop Mom from keeping the party going all the way home. Ariana enjoyed a birthday cake and celebrated with the rest of her siblings, except for her older sister Brielle, 19, who is currently in Los Angeles with her boyfriend.

The Don’t Be Tardy star also took a moment to wish her daughter a happy birthday with a sweet Instagram montage made up of photos of Ariana over the years.

“HAPPY BIRTHDAY to one of the most incredible people I know…my sweet @arianabiermann,” she wrote. “I can’t believe you are 15! My gosh where did the time go?! You amaze me each and every day, the person you are, the person you are becoming! I get so exited to think of all the amazing things you will do in your lifetime!”

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“Your heart is so pure,” the proud mother continued. “This world is such a better place with you in it! I hope you enjoy your day today… (I might still show up with cupcakes at school) even though you are in high school! I love you to the moon and back a zillion times! HAPPY BIRTHDAY MY SWEET ANGEL! #AllHerFriendsSqueezeHerAllDayTodayAtSchool.”

Don’t Be Tardy airs Wednesdays (10 p.m. ET) on Bravo.