The Duke and Duchess of Cambridge joined in with the crowd's Mexican waves at Wimbledon as tennis fans celebrated Andy Murray's emphatic quarter-final victory.
William and Kate took their seats in Court One shortly before play got under way in the third seed's match against Spain's Nicolas Almagro.
The couple were accompanied by the president of the International Tennis Federation, Francesco Ricci Bitti, and were welcomed with a round of applause from the stands.
Murray was given an even greater reception as the match began, with the partisan crowd waving Union flags and roaring at every point he won.
Kate, wearing a royal blue dress, navy blazer and dark glasses, and William, also in a navy blazer and white shirt, both looked relaxed as they chatted to spectators sitting nearby in the "Olympic Family" seating area.
They seemed happy to have fun with the crowd, taking part in the Mexican waves which spread around the stands during the change-overs, and clapping enthusiastically as Murray cruised to a 6-4 6-1 win.
The couple were given another round of applause as they left the stands, while Murray, who will now play either Novak Djokovic or Jo-Wilfried Tsonga in the last four, walked off the court to deafening cheers.
Support for the 25-year-old Wimbledon 2012 finalist also came from his mother, Judy Murray, and girlfriend, Kim Sears. Despite the crowd's enthusiasm for the British number one's Olympics bid, there were still rows of empty seats in the stands, particularly in the lower tiers.
Hundreds of fans visiting the All England Club without tickets to the match gathered outside the court on Murray Mound to watch the action on the big screen.
The tennis is the latest in a number of Olympic events attended by William and Kate, who earlier this week visited the Athletes' Village to meet members of Team GB.