Reality star Kim Zolciak-Biermann marks her eldest daughter's 21st birthday with a gift fit for an adult: a customized handgun.

Happy Birthday, Brielle

According to a report from People, the 39-year-old Don't Be Tardy star surprised daughter Brielle Biermann with a party that features artworks of topless women and a pretty rose gold pistol. Silver balloons spell out "Happy Birthday Brielle."

The customized Glock 43 was wrapped in a Princess Elena of Avalor wrapping paper, which brother Kash helped her rip open.

In a video featured on TMZ, Brielle is heard asking what she's going to do with the handgun. Initially, the birthday girl is too scared to even touch her mother's gift.

"You're moving out so it's time to figure it out," Kim tells her eldest child. "It's not loaded. It's a special one for you, it's rose gold."

Kim and Brielle both documented the day's events on Snapchat with the 21-year-old sharing a photo of her new gun with the caption "Rose gold gun!!! Thanks papa."

While Brielle has tried shooting at a gun range, TMZ reports that she is not licensed yet. However, the state of Georgia doesn't require a license for gun owners who keep their firearms at home, in the car, or in a business place.

Brielle Moves Out

One of the reasons behind Kim's present to her daughter is Brielle's plans of moving out of the house. In an interview with TooFab last December, Brielle revealed that she will be moving out of the family home around her birthday.

While she initially wanted to share a place with boyfriend, White Sox minor league player Michael Kopech, the couple decided that it's better for Brielle to try living on her own for around six months before moving in together.

"I don't ever want to have to depend on a man, so I want to learn to do things on my own and support myself before I go from living in my parents house to living with a man," she explains, adding that she wants to figure out what to do with her life, whether its college or something else.

Kim Reacts To School Shooting

The reality star's explosive present to her eldest child comes after she bought bulletproof backpacks for her children following the tragic Parkland, Florida, school mass shooting that killed 17 people and injured more.

Kim shared the conversation between her and husband, Kroy Biermann, which ended in the couple deciding to purchase the bulletproof backpacks for their brood. The reality mom points out that the purchase is better than doing nothing.

Kim is mother to Brielle, 21, Ariana, 16, KJ, 6, Kash, 5, and the twin siblings Kane and Kaia, 4.