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.

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

Bethenny Frankel Models Underwear from Skinnygirl Shapewear Collection

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

Bethenny Frankel flaunts her slender waistline while plugging Skinnygirl bras

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

Bethenny Frankel, 51, shows off her toned abs in Skinnygirl athletic bra and shapewear

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Bethenny Frankel flaunts her slender waistline while plugging Skinnygirl bras

Video: Bethenny Frankel flaunts her toned body in Skinnygirl underwear

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

Bethenny Frankel Shares Unfiltered Underwear Photo

Bethenny Frankel flaunts her slender waistline while plugging Skinnygirl bras

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