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Kate Middleton; Cheltenham Gold Cup Festival 2007 Day 4; 16th March 2007; 20185; Only; Zara Philips arriving at the Cheltenham Festival; Cheltenham Gold Cup Festival 2007 Day 3.; 15th March 2007; 20133; Only; (Photo by Jules Annan/Photoshot/Getty Images)

Kate Middleton; Cheltenham Gold Cup Festival 2007 Day 4; 16th March 2007; 20185; Only; Zara Philips arriving at the Cheltenham Festival; Cheltenham Gold Cup Festival 2007 Day 3.; 15th March 2007; 20133; Only;  (Photo by Jules Annan/Photoshot/Getty Images)