27/05/2013 Share Serena Williams flaunts her BUM in her zipper laden dress (PHOTOS)

Sexy tennis goddess Serena Williams was out and about looking red hot in an exposed back zipper dress. She was said to have been hitting up the “The Late Night Show by David Letterman” in New York City.

In a back zipped dress and new black Louboutin pumps, the tennis pro made her way to a taping of “Letterman”