Bethenny Frankel, 51, displays her impressively taut abs as she flashes Skinnygirl underwear

Bethenny Frankel put her impressively taut abs on full display on Thursday as she gave her Instagram viewers a peek at her underwear, which was made by her brand Skinnygirl.

Bethenny Frankel flaunts her slender waistline while plugging Skinnygirl bras

Bethenny Frankel Rocks Underwear & Sexy Tank Top — Photo – Hollywood Life

Bethenny Frankel, 51, displays her impressively taut abs as she flashes Skinnygirl underwear

Skinnygirl by Bethenny Frankel, Seamless Shaping Briefs Multi Color Medium : Clothing, Shoes & Jewelry

Bethenny Frankel flaunts her slender waistline while plugging Skinnygirl bras

Bethenny Frankel, 51, displays her impressively taut abs as she flashes Skinnygirl underwear

Bethenny Frankel flaunts her slender waistline while plugging Skinnygirl bras

Skinnygirl by Bethenny Frankel, Seamless Shaping Brief Underwear Black/Nude/White - 3 pack Small : : Clothing, Shoes & Accessories

Bethenny Frankel Rocks Underwear & Sexy Tank Top — Photo – Hollywood Life

Bethenny Frankel Shares Unfiltered Underwear Photo

Bethenny Frankel, 51, displays her impressively taut abs as she flashes Skinnygirl underwear