Dame Kelly Holmes joined the Duchess, and their group spent most of the match clapping and cheering as the British team played their hearts out on the turf below.
Kate had dressed for the warm weather in an all white outfit, swapping her skinny jeans and Smythe blazer for a ladylike A-line skirt and sleeveless Team GB kit shirt.
Completing her outfit, The Duchess of Cambridge wore her white Hobbs 'Neston' belt and her navy Stuart Weitzman 'Corkswoon' wedges.
Kate wore her Givenchy sunglasses, her pearl stud earrings and her diamonds by the yard Tiffany bracelet.
Kate's skirt has been ID'ed (thanks to 'Tatiana's Delights on FB). It is by Zara from their Women's line.
An additional set of detailed pictures from 'My Obsessions' on FB.