Prince William and Princess Kate are currently in Boston for a three-day royal tour centred around the second annual Earthshot Prize awards ceremony.
SEE: Prince William and Princess Kate kick off day two of Boston royal tour - best photos
The royals have a jampacked schedule while they're stateside, so it came as a surprise when they deviated from their itinerary on Wednesday night.
WATCH: Prince William and Princess Kate surprise crowds at Boston NBA game
The Prince and Princess of Wales attended a basketball game, which was in the schedule, but rather than leaving early as planned, they stayed for the whole game.
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"They were only due to stay for the first few quarters and they ended up staying for the whole match," said HELLO!'s royal editor Emily Nash, who is on the tour.
"William and Kate, as we know, love sports," Emily continued. "They love a bit of competition. They seem to be asking lots of questions, taking in all the action and getting to meet some of the players. I think they had a great night."
© Photo: Getty ImagesPrince William and Princess Kate were animated at the basketball game
William and Kate were cheered by spectators as they took their seats courtside, and during the game they appeared on the FanCam screen to more loud cheers from the arena.
MORE: Prince William and Princess Kate: Mixed reaction on day one of tour explained
Rather than casual attire, as is common as sports events, Princess Kate opted for a chic ensemble of a vintage blue tweed jacket by Chanel paired with black dress pants, while Prince William cut a dapper figure in a dark suit and chambray shirt.
© Photo: Getty ImagesPrincess Kate and Prince William looked smart at the game
We can't wait to see what else they get up to during their tour!
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