AceShowbiz - Something terrible happened in the Biermann family. Kim Zolciak recently took to Instagram Stories to reveal that her 5-year-old daughter, Kaia Biermann, broke her arms when she was playing with her friends at school.

In a video she shared on the photo-sharing site, the "Don't Be Tardy..." star recalled receiving a call from the little girl's school and was told that Kaia's wrist had been hurting. And when Kim later went to check her out, she found out that Kaia broke two bones is her arm after falling at the playground. The reality TV star didn't reveal her daughter's current condition, though it's safe to say that she's currently receiving the treatment that she needs.

But that wasn't the only reason why Kim felt she was having a "crazy a** day." She said on the social media site, "So to give you guys an update on the day, it started with my housekeeper calling out today because her ankle hurts. My nanny was an hour late today due to Uber. And that was a little chaotic."

Despite all the chaotic things that happened on that day, Kim was still able to happily celebrate her daughter Ariana's 18th birthday. Sharing a picture of the mother-daughter duo, the former "The Real Housewives of Atlanta" star added a sweet caption that read, "These last 18 yrs have been so incredible. You have brought so much joy to our entire family! You gave me more strength then you will ever know! You taught me more than I honestly thought I could ever learn... We made it!!"

She continued by saying how proud she is of the teenager, gushing over her "kindness, generosity, constant willingness to help, determination and drive doesn't go unnoticed!" Kim added, "You truly AMAZE me. I look forward to watching you move mountains, chase your dreams and accomplish all your goals! There is no doubt you are a force to be reckoned with. Your dad, siblings and I love you far beyond words could ever describe! HAPPY BIRTHDAY."