Kim Zolciak's Slim Post-Baby Body: How She Lost the Weight (and Keeps It Off)

It's not easy getting your body back after having a baby, but getting into pre-baby shape after having twins? That takes twice the work!

Kim Zolciak-Biermann knows this firsthand, but as you can see from this recent swimsuit snap, the former Real Housewives of Atlanta star has one phenomenal figure. It's hard to believe, though, that the 36-year-old mom of six looks like this after giving birth to twins Kaia Rose and Kane Ren less than seven months ago. So how on earth does she do it?!

"She exercises a lot and uses Xenadrine [a weight loss formula]," a source tells E! News. "She eats a lot of fruits and vegetables as part of her diet...She does not focus on how much weight she loses, she focuses on figure rather than pounds."

"The pregnancy was harder with the twins," adds a source, "but she recovered faster than other pregnancies." (In addition to the twins, Kim has two daughters from a previous relationship—Brielle, 17, and Ariana, 13—and two sons with husband Kroy Biermann—Kroy Jr., 3, and Kash, 22 months.

Now, though, the blond bombshell, who gained a reported 50 pounds during her pregnancy with Kaia and Kane, is feeling full of energy and loves the way she looks," adds a source.

She should be proud, too, because she sure is looking svelte and sexy these days!

—Reporting by Michelle Falls