We recently saw Kate wear this dress to the opening of the The Road To 2012: Aiming High exhibition at the National Portrait Gallery.
After the tennis, the couple zipped across town to watch cycling at the Velodrome. Team GB went on to win gold in a breathtaking race.
Kate & Wills were joined by Prince Harry and Sophie Countess of Wessex.
Kate opted for a quick wardrobe change and switched to her white Team GB polo shirt and navy Zara Slim Pop jeans. She also put her hair up in pony tail.
Photo credit: WKW