Kim Zolciak, Kroy Biermann, Twins, First Time

Splash News

It sure didn't take Kim Zolciak-Biermann long to get her pre-baby body back!

The former Real Housewives of Atlanta star says she "gained 50 pounds" during her pregnancy with twins Kaia and Kane, telling Life & Style that just three months after giving birth, she's back "between a size 2 and a size 4."

"I won't get on the scale," the 35-year-old said, "but all my clothes fit again!" And it's not just winter clothes Kim's cool with—she says she's "ready to put my bikini back on!"

So how is it that Kim shed the pregnancy pounds so quickly? "I take Xenadrine [a weight loss formula] for energy to work out and do an hour of cardio each day," she tells the mag.

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It didn't take her long to start losing the baby weight either. She was pretty trim almost instantly after giving birth. Her 16-year-old daughter Brielle shared a snap of her svelte mom in sweats, musing, "how is my mom a size 4... it's been 9 days since she gave birth to twins."

Kim, however, is not so focused on her body that she's missing out on any of the joys of motherhood. She Instagrammed a sweet snap of herself cuddling with one of the twins earlier this month, exclaiming that "life doesn't get any better than this."

In addition to Kai, Kane and Brielle she's mom to 12-year-old Ariana, 2-year-old son Kroy. Jr and 17-month-old son Kash.

Of course, Kim has help from hubby Kroy Biermann, but she also probably gets in a fair amount of cardio chasing after all those kids!

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