Headgear is mandatory at all British functions -- especially at a good royal wedding.
And there have plenty of outrageous hats at Windsor family gatherings over the years, but as Gawker points out, few are quite as meme-worthy as the Princess Beatrice's hat at the royal wedding. It even has its own Facebook page with over 22,000 likes.
There's also a Tumblr keeping it going, with different photoshopped images of the redhead and her accessory. The daughter of the Duke and Duchess of York has sported a number of questionable hats over the years, but this one may have taken the sartorial cake.
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From The Front (AP):
In The Car (AP):
Stepping Out (AP):