Rachel Zoe: Bikini in St. Bart's!

Rachel Zoe shows off her super thin thin frame in a teeny black bikini on a beach in St. Bart’s on Thursday (January 7).

The 38-year-old celeb stylist has been vacationing since Christmas with her husband/business partner Rodger Berman. Rachel tweeted, “[I'm] laying low in St. Barths. Dinners with friends. Battling bronchitis. Hopefully sun will heal me. :( ”

Rachel‘s protruding rib cage was apparent on the red carpet back in December 2008.

Get well soon, Rachel!