Credit: Photo via Instagram

Wow — time really does fly when you're having fun! And, by "fun," we mean "popping out babies like a gumball machine." It's hard to believe a year has gone by, but former Real Housewife of Atlanta Kim Zolciak is celebrating little Kash Kade's first birthday today!

The Don't Be Tardy mama of soon-to-be five took to Twitter last night to express her own disbelief at this milestone.

"I can't believe Kash is going to be 1 tomorrow!!!!!!!!!!! Where did the time go?" she wondered.

Before she knows it, Kash will be a big brother! Kim is expecting her third baby with hubby Kroy Biermann later this year. The couple knows what they are having, but have chosen to keep the gender a secret.

Do you think it's a third boy for Kim and Kroy or a little princess to join older sisters Brielle and Ariana? Share your predictions in the comments section below!