It's 5:00 a.m. on Fifth Avenue, and 16-year-old Gemma Beasley is standing in front of Tiffany & Co. wearing the perfect black dress with her coffee in hand--just like Holly Golightly. As the cofounder of a successful Tumblr blog--Oh Yeah Audrey --devoted to all things Audrey Hepburn, Gemma has traveled to New York in order to meet up with her fellow bloggers for the first time. She has meticulously planned out a 24-hour adventure in...