Plus, Naomi Campbell, Kate Moss and Ellie Goulding were among the celebrity guests.
And an heirloom emerald tiara.
The Duchess of Cambridge brought a splash of color to Windsor Castle in her go-to designer.
Also, Princess Eugenie's wedding edition!
And a festive fascinator by Jane Taylor.
Plus, Soo Joo Park, a pantless Dustin Yellin and a couple of shirtless guys wearing liquid leggings.
After the dress, the royal wedding is really all about the hats. And fascinators. Some opted for opulence while others stuck to tradition, and some looked as though they either over thought or put no thought into their head gear at all. Among the best were the devilishly elegant Zara Phillips, Sweden's Crown Princess Victoria, and Queen Sofia and Princess Letizia of Spain. But there were some who buckled under the pressure, as you will see after the jump.