Kim Zolciak shows off size 4 selfie nine days after giving birth, even daughter Brielle can't believe it

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kim-zolciak-selfie-twitter.jpgThere's dropping baby weight fast -- and then there's this.

On Wednesday (Dec. 4), former "Real Housewives of Atlanta" star Kim Zolciak showed off her slim post-baby body in a selfie sent to daughter Brielle, just nine days after welcoming twins Kala and Kane into the world with husband Kroy Biermann. According to her daughter's tweet, mom's already at a size four.

Brielle tweeted a screen-grab of an exchange with her mom, in which Kim said, "My belly is almost gone!!!" before sending a photo of herself standing in front of a mirror wearing a black tank top and sweatpants. Following that, she shared another photo of her mom, with the caption: "HOW."

The day before, the younger Zolciak tweeted about her mom's size, as well, asking "How is my mom a size's been 9 days since she gave birth to twins."

How, indeed, Brielle. How, indeed.
Photo/Video credit: Twitter