(CNN) — Prince William and Kate start their whirlwind tour of New York City on Monday, one that could include mingling with the American version of royals.

The Duke and Duchess of Cambridge arrived Sunday for a three-day trip, their first to the Big Apple.

Excited royal watchers gathered outside their hotel hours before their arrival, braving the nighttime winter chill. The Empire State Building also got in on the action, changing its world-famous lights to red, white and blue — the colors of the Union Jack flag.

Their flurry of activities include a children’s craft group in Harlem with the first lady of New York City, Chirlane McCray, and a conservation reception with Hillary and Chelsea Clinton.

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