Bar Refaeli showed off her back in a frothy Marchesa gown at the fashionable 2011 Whitney Gala last night in NYC. The soiree, held at Hudson River Park's Pier 57, also drew Marchesa designer Georgina Chapman and actress Michelle Monaghan. Bar attended the event alone, but spent much of the Summer traveling with friends and rumored love interest, businessman David Fisher. Bar's latest journey overseas was a trip to Barcelona, where she attended a few events in her role as spokeswoman for Especially Escada. The trip wasn't all work, however, and once her fragrance duties wrapped up, she enjoyed some downtime with a buddy at a local amusement park.