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Prince William, Kate Middleton attend Heat-Celtics in Boston

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Prince William, Kate Middleton attend Heat-Celtics in Boston (0:48)

The Prince and Princess of Wales sit courtside at Wednesday's game between the Miami Heat and the Boston Celtics at TD Garden. (0:48)

The Prince and Princess of Wales, William and Kate, were courtside at Wednesday's game between the Miami Heat and Boston Celtics at TD Garden.

The royal couple is in Boston for the Earthshot Prize, a competition aimed at tackling climate change. It is their first visit to the United States in eight years.

"Catherine and I are delighted to be back in the United States and are extremely grateful to Governor Baker and The First Lady of Massachusetts for their warm welcome into Boston," Prince William said in a statement.

The last NBA game they attended was a Cleveland Cavaliers versus Brooklyn Nets game at Barclays Center on Dec. 8, 2014.