NEW YORK, NY – SEPTEMBER 04: Pippa Middleton attends the women’s singles quarterfinals match between Samantha Stosur of Australia and Victoria Azarenka of Belarus on Day Nine of the 2012 US Open at USTA Billie Jean King National Tennis Center on September 4, 2012 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images)