It was the second event of the day for the young couple, who had earlier visited the National September 11 Memorial and Museum.
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Their visit comes after Kate took the chance to bond with other youngsters as she visited a local child development centre in Harlem, York on Monday. Guided by New York's First Lady Chirlane McCray, the Duchess, who is five months pregnant with her second , headed to Harlem in the northern section of Manhattan.
Showing her maternal side, the Duchess met three and four-year-old youngsters who are being supported by the centre, and eagerly took part in their festive activity – wrapping up donated Christmas presents and making crafts.
Headlines have been dominated by Kate's hair, her outfits, how well she looks and her friendly manner. The royal couple have met anyone who's anyone in New York, including Beyoncé and Jay Z, Hillary Clinton and star basketball LeBron James.
William also stunned locals by taking a scheduled commercial flight to Washington to meet President Obama, accompanied by a minimal entourage.