Prince William and Kate Wrap up US Tour

PHOTO: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge take part in an art class as they visit The Door/City Kids Foundation, Dec. 9, 2014 in New York. PlaySamir Hussein/Pool/Getty
WATCH Prince William and Kate Middleton Wrap-Up NYC Trip

Prince William and Duchess Kate wrapped up their trip to the United States today, arriving back in Great Britain early this morning.

The royal couple on Tuesday crowned their whirlwind visit to New York City with a black tie dinner at the Metropolitan Museum of Art, raising money for their alma mater - the University of St. Andrews - where they met.

"It is often said by undergraduates of St. Andrews that you leave the university in either one or two states: either married or an alcoholic," said Prince William. "Fortunately for Catherine and me, we ended up married."

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SLIDESHOW: All the Best Photos of Will and Kate's Trip to New York City

The couple braved the heavy rains and wind earlier in the day at the National September 11 Memorial & Museum. William held an umbrella for his pregnant wife as she placed flowers and a personal note on a plaque memorializing those killed.

Afterwards, they enjoyed a performance at the Door and CityKids Foundation, organizations that provide help to disadvantaged youth. William led the crowd in a standing ovation and gave his contact information to one of the performers, offering to help him reach the next level.

"William was absolutely blown away by Steven Prescod's performance," said Daily Mirror correspondent Victoria Murphy. "He thought it was absolutely fantastic and he was adamant that he really wanted to make Steven a star.

He later enjoyed a trip to the top of the Empire State Building with New York City Mayor Bill de Blasio and Empire State Realty Trust CEO, president and chairman Tony Malkin.

A photo of Cleveland Cavaliers star LeBron James with his arm around Kate continued to grab headlines, but while some balked at a possible breach of etiquette protocol, the palace says no offense was taken.

Britains Prince William, left, and Kate, Duchess of Cambridge pose with Cleveland Cavaliers LeBron James, right, backstage of an NBA basketball game between the Cavaliers and the Brooklyn Nets on Monday, Dec. 8, 2014, in New York.Neilson Barnard/AP Photo
Britain's Prince William, left, and Kate, Duchess of Cambridge pose with Cleveland Cavaliers' LeBron James, right, backstage of an NBA basketball game between the Cavaliers and the Brooklyn Nets on Monday, Dec. 8, 2014, in New York.

"Kate and William are both casual. They are not stuffy," said Murphy. "I think they like it when people relax around them and are able to be themselves."