Oops! LeBron Touched Kate

Prince William and wife Kate met LeBron James Monday night after the Cleveland Cavaliers played the Brooklyn Nets in New York, and the NBA star accidentally breached royal protocol ... by putting his arm around Kate. As Time notes, the understood—even if not explicitly stated—etiquette dictates that when meeting royals, don't touch or talk to them unless they touch or talk to you first. "Americans are much more tactile than we Brits, and this is another example of an American being too touchy feely with British royalty," an etiquette expert tells the Daily Mail. Kate seemed fine with the display, however; shortly afterward, when William joked that his shoe size was "half the size" of LeBron's, she exploded in a "fit of giggles," the Mail notes. (Remember when Michelle Obama hugged the queen?)