"They were amazing," one wedding guest told Women's Wear Daily. "It was like watching Dancing with the Stars. They definitely took lessons."
Guests at the Astor Courts also enjoyed a menu of farm-fresh salad, risotto, beef short ribs and grilled fish, plus toasts by the mother and father of the bride.
Former president Bill Clinton raised a glass for his new son-in-law, joking to guests that he was, "looking forward to having some company because I'm outnumbered."
The father of the bride included a sentimental note as well, telling the 400 guests, "Despite the fact that we have had interesting careers, we still consider the most important job we ever had being the parents of Chelsea."
As the newlyweds enjoy their two-week-plus honeymoon (at an undisclosed location), guests are likely catching up on sleep. The first shuttle bus didn't depart from the reception until 1 a.m., reports one guest, while others partied until 3 a.m.