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 poses in underwear and bra to celebrate 50

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Bethenny Frankel flaunts her slender waistline while plugging Skinnygirl bras

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

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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

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