The Duke of Sussex and Hollywood stars including Timothee Chalamet, Sydney Sweeney and Ben Stiller were among the crowd at the NBA Finals in San Antonio.
Harry was in the eighth row at game five of the finals series between the San Antonio Spurs and the New York Knicks - while a number of celebrities were courtside to watch the game. The 41-year-old - who was without his wife Meghan or their children - attended the match with US Army veteran and Purple Heart recipient JP Lane and sat beside NBA Commissioner Adam Silver.
A thrilling match ended with the New York Knicks claiming their first NBA title since 1973 on the back of a 94-90 win.
The duke was already in Texas for the Warrior Games – an event for wounded, injured or ill military personnel organised by the US Government.
Other famous faces at the match included Euphoria star Sydney Sweeney attended with boyfriend Scooter Braun, while Timothee Chalamet and Ben Stiller were in the front row.
Harry's appearance came hours after the King celebrated his official birthday with a ceremony showcasing the British Army's ceremonial prowess.
Charles took part in the famous Trooping the Colour event on Saturday, where military pomp and pageantry were on display in the heart of the capital.
The Princess of Wales and her children joined the Queen and thousands of spectators at Horse Guards Parade in Whitehall to view the spectacle featuring some of the nation's most prestigious regiments.
Future king Prince George, 12, Princess Charlotte, 11, and Prince Louis, eight, watched their grandfather from the first-floor window of the Duke of Wellington's former office overlooking the parade ground in central London.
Crowds gathered in The Mall to watch the royal family's carriage procession from Buckingham Palace, with Charles and Camilla in the middle of a Sovereign's Escort provided by the Household Cavalry Mounted Regiment.
