Zara completed her run in nine minutes and 55 seconds.
Kate dressed down in her navy blue J Brand 811 skinny jeans, her Team GB/Adidas white polo shirt and her navy Smythe blazer.
Her accessories included her black Stuart Weitzman 'Corkswoon' black wedges ($225 and available at zappos.com), her Givenchy SGV 761 (Was £145.00 on sale for £127.00) and a London 2012 Olympics Logo Pin on her lapel in Green ($8.95).
Thanks to WKW for the updated info. Kate's shoes, are in fact, navy suede and not black as we had first thought. These are Stuart Weitzman made for Russell and Bromley called 'Coco.' They are available in store, but not yet online.
Per Russell & Bromley on Twitter 'We can confirm that the Duchess wore Stuart Weitzman for Russell & Bromley SW Coco in Navy Suede to the Olympics yesterday.'