Kim Zolciak Is Not The Only Celebrity Mother With Shocking Post-Baby Weight Loss: Check Out Alicia Keys, Halle Berry, And More [SLIDESHOW]

Kim Zolciak, a star on the reality show "The Real Housewives Of Atlanta," welcomed her second son with her NFL husband, Kroy Biermann, in August, and she is already flaunting her post-baby body. 

In a photo she tweeted, Zolciak, 34, shows off her already shockingly trim arms and flat stomach, just two weeks after giving birth.

"Seriously ... who looks like this after 2 weeks of having a baby?" her daughter, Brielle Biermann, wrote, with a link to the picture.

When asked by Perez Hilton how she was able to regain her figure so quickly, Zolciak said, "No cleansing, I'm breastfeeding!"

Zolciak met Biermann, 26, during filming of the third season of "The Real Housewives Of Atlanta," and the two wed in their Atlanta home last November. 

While Zolciak's weight loss is certainly surprising, she is not the only celebrity mother who quickly regained her former body after giving birth. Check out these photos of others, such as Mariah Carey, Jessica Alba and Halle Berry.

Mariah Carey gave birth to twins, a boy and girl, with her husband Nick Cannon in April 2011. “I put on 70 lbs., but if you look at me in pictures, you’d think it was more like 9,000 lbs. I have a lot of empathy for people who have to lose a lot of weight," she told Shape magazine. After giving birth, she became a spokesperson for Weight Watchers. “I used to be able to slim down just by exercising more, but that’s changed. Since having the babies, I realize that 90 percent of losing weight is my diet," she said.

Halle Berry gave birth to a beautiful girl, Nahlia, in 2008, and shortly thereafter, she was back in fighting form. During her pregnancy, the Oscar winner told InStyle she felt "fantastic" thanks to eating right and keeping fit with yoga, swimming and an elliptical machine. "Right now I just have so much joy and energy. I can just go and go and go," she said.

Jennifer Hudson famously was criticized for her weight ever since she became recognized due to the hit talent competition "American Idol." After giving birth to her son David Jr., in 2009, she became a spokeswoman for Weight Watchers in 2010, telling Robin Roberts of Good Morning America, "I decided to do Weight Watchers. I feel like I've conquered the world." She now claims to be a size 6 after losing around 80 pounds.

Alicia Keys gave birth to her son, Egypt, in 2010, and already has her figure back. She reportedly worked out five days a week with celebrity trainer Harley Pasternak and followed his 5-Factor Diet program.

Beyonce gave birth to her daughter, Blue Ivy, only eight months ago, and already she has her curvaceous figure back. In June, just five months after giving birth, she gave her first post-baby performance, wearing a cropped, spangled top and micro-mini skirt.

Kim Zolciak showed off her amazing post-baby body, just two weeks after giving birth.