Kim Zolciak is looking thinner than ever in her latest Instagram photo.

Kim Zolciak Shows Off Bikini Body, Thanks Diet Shakes For Weight Loss

Earlier this morning, Zolciak took to Instagram, where she shared a photo of herself wearing a waist trainer. In the photo, Zolciak's waist looked tiny, and the pressure of the corset appeared to have amped up her cleavage.

"Soooo you guys finally talked me into trying a waist trainer!" Zolciak wrote on Instagram on Wednesday. "I can't believe how tiny it makes my waist I'm obsessed with @nowaistclique waist trainer and it doesn't show through my clothes!"

Kim Zolciak Debuts Thin Waistline & A $10,000 Chanel Purse, Tells Fans She's 'Spoiled'

Since giving birth to twins Kaia and Kane in Nov. 2013, Zolciak has been getting into the best shape of her life. In addition to exercising with her NFL husband, Kroy Biermann, the Don't Be Tardy star has been drinking healthy shakes, which help her keep her weight down.

On Tuesday, Zolciak told fans of her latest challenge, which involves her legs.

"Spring Break is almost here soooooo Pleeeze (I feel better when I know somebody else is doing it too) Do this 30 day challenge with me and let's watch our legs transform!" she wrote.

Along with her message, Zolciak shared a link to 310 Nutrition's website, and encouraged fans to email her their before and after photos for a chance to appear on her page.

In addition to her twins, Zolciak is mother to four other children, daughters Brielle and Ariana, and sons K.J. and Kash Kade.