PICS: Prince William, Duchess Kate Step Out Day After Wedding

Prince William and Kate Middleton Credit: John Stillwell/PA (2)

Royal hangovers perhaps?

After a truly epic day of pomp and circumstance followed by romance and revelry, a fresh-faced William and Kate -- a.k.a. the Duke and Duchess of Cambridge -- were spotted holding hands exiting Buckingham Palace on Saturday. (See their official wedding portait!)

The Duchess, 29, wore a light blue mini-dress, crisp black blazer and wedge heels. Her husband, 28, wore a blue blazer, white shirt and khakis.

VIDEO: Wedding highlights from the dress to the kiss!

The newlyweds wound up their wedding day with 300 friends for a bash at Buckingham Palace. Kate changed into a stunning evening dress designed by Sarah Burton of Alexander McQueen (who also made her wedding dress).

William's kid brother Prince Harry toasted the new couple, a guest told Us Weekly. Harry, 26, was "brilliant," the guest said. "We all wished he could have just carried on. It was perfect. He was very nice."

Commemorate Will & Kate’s big day with our Us Collectors Edition: Royal Wedding with all the photos, anecdotes and details of the wedding. Available for pre-order now and on sale May 6.