Bethenny Frankel is posing in skimpy underwear and entertaining Instagram as she explains how the look works as a bikini. The former Bravo star, 50, is fresh from a sun-drenched car selfie, one placing her at the beach - well, on her way - and promoting her Skinnygirl brand as seen by the company logo on the briefs. Bethenny, who even impressed Emily in Paris actress Lily Collins with her post, made it curves, muscle, and humor all in one go - check it out below.