The duchess of Cambridge, 30, and her sister Pippa, 28, cheered on Scottish hopeful Andy Murray, the first Briton to appear in the Wimbledon final since Bunny Austin in 1938.
According to the Huffington Post, Kate sported a white Joseph dress and jacket she wore previously on her Royal Tour and at the Epsom Derby last year. Pippa wore a blue and white dress by Project D.
Though Murray lost the match to Switzerland's Roger Federer, Kate and Pippa stood during Murray's emotional speech to the loud and patriotic crowd at the All England Club in London.
No British player has won the tournament since Fred Perry in 1936.
Both Kate and Pippa have made multiple appearances at Wimbledon this year. Pippa has been a regular in the stands and Kate attended July 4, along with husband Prince William.
Prince Charles and his wife Camilla watched Roger Federer play Fabio Fognini on June 27, Charles' first time at Wimbledon since 1970. Both players bowed down to the royal couple before their match.
Also seated in the royal box behind the sisters were Prime Minister David Cameron and David and Victoria Beckham. The duchess of Cambridge reportedly stopped to chat with the Beckhams before taking her seat.