Kim Zolciak has no problem sharing a belfie (butt selfie) with her 1.9 million Instagram followers.

The 37-year-old Don't Be Tardy star posted a pic of herself lying face down in nothing but a thong and a T-shirt before undergoing a contouring procedure. "Venus Freeze at Magnolia Med Spa this morning! ?? Gotta keep my sh** tight! #BeachBoundTomorrow #LastWeekBeforeIStartFilming #StarBucksInHandOfCourse," she wrote.

WATCH: Kim Zolciak and Kroy Biermann Take Their PDA to Uncomfortable Levels

According to the spa's website, the treatment helps to reduce cellulite and contour the body to battle flab and loose skin.

While Zolciak has slammed Photoshop and plastic surgery rumors, she admitted in December that she got a tummy tuck after giving birth to twins. "So you all know after the twins I had a hernia and while fixing the hernia I opted to have a tummy tuck as well!" she captioned a swimsuit selfie. "My scar is very low and very thin much thanks to @drhochstein but I still had a scar. I could wear bikinis you would never see it."

WATCH: Kim Zolciak Says She Was Born With a Thigh Gap

And this mother-of-six loves a bikini! "No need to photoshop!" Zolciak captioned a bikini-clad video of herself last month. "Do you like my little bathing suit?"

For more on Zolciak's sexy skin-baring Instagram pics, check this out:

Related Gallery

Hollywood Bikini Bods of 2015 & 2016