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William & Kate's Royal Wedding

The big day isn't until Friday, but Londoners who were awake in the middle of the night got a preview of what to expect on Prince William and Kate Middleton's wedding.

The royal wedding dress rehearsal took place in the wee hours this morning and featured more than 1,000 soldiers, horses, carriages, chaffeured Bentley and RAF flyover.

And by the looks of things in the video above, everything seemed to proceed perfectly, except for two conspiciously missing things...

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The bride and groom didn't attend the dress rehearsal, but they did use a practice Kate for the festivities.

A "pretty brunette" emerged from the exact car that will carry Kate on Friday, prompting cheers from the crowd before they realized it was just her stand in.

And naturally, her double gave no hint as to what the mysterious wedding dress will look like. She was wearing pants and a black sweater.

The number one goal for the security guards will be to protect the future princess, while still ensuring the public can get a clear view of her.

Priorities, people!

Kate was apparently busy last night with another important test run of her own: how to wear her coif.

She was snapped Tuesday evening wearing her hair swept back in the car with sister Pippa.

An updo for the win? Stay tuned!