Kim Zolciak is looking great just over a year after giving birth to twins.

'Don't Be Tardy' Star Kim Zolciak Debuts Massive Diamond Ring

In a new Instagram post, the Don't Be Tardy star and wife of NFL player Kroy Biermann showed off her bikini body in two new photos. Along with her post, Zolciak shared a special message with fans, revealing how she shed her baby weight.

"Trying on bikinis for my vaca with hubby," Zolciak wrote on Instagram on Tuesday. "Thankful for @310nutrition for keeping me in check! The shakes really help me!"

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While filming season three of The Real Housewives of Atlanta, Zolciak met Biermann at a charity event. Within two years, Zolciak and Biermann were married and starting their family. Since June 2011, Zolciak has given birth to four children, Kroy Jagger, Kash Kade and twins Kaia and Kane. Zolciak also has two older daughters, Ariana and Brielle, from previous relationships.

After welcoming her twins, Zolciak quickly dropped her baby weight with the help of 310 Nutrition and exercise with her athlete husband, and although she's now back to her pre-baby size, she's continued on with her healthy lifestyle.

"You guys keep asking what's my favorite flavor, honestly I'm torn between vanilla and chocolate!" Zolciak explained. "I LOVE peanut butter so I add that to the chocolate one, and I love strawberries so I add that to the vanilla one! It's all depends on your preference. The cleanse is really helpful to jumpstart you! #NoFilter #HerveandAgent #ImPosingForYall #310shake #310Nutrition #MyHubbyLovesTheseCurves."

Tags: kim zolciak The Real Housewives of Atlanta Bravo Reality TV