Watch: First Look at the Royal Wedding Procession Rehearsal!

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Horses! Carriages! Guards! Oh my! It's your first look at the royal wedding. Up to a thousand members of the Army, Navy and RAF carried out a pre-dawn royal wedding dress rehearsal today, and we have your front-row seat.
Sources told ET late last night that a rehearsal was planned for 4:00 AM to 6:30 AM. The daily shooting schedule was immediately shifted to mobilize Nancy O'Dell to Westminster Abbey and Chris Jacobs at Buckingham Palace.
With the entire world in anticipation of Friday's ceremony, nothing was left to chance. Every aspect of the arrangements for Friday is being practiced to the last detail, including music, flowers, food and especially security. Timings were tested to the second, and all armed forces were given the chance to practice their role in full uniform. Some of the soldiers, sailors and airmen practicing their duties were Prince William's colleagues.
Around 4:50 AM, the pre-dawn dress rehearsal began, passing along The Mall, along Whitehall, past Westminster Abbey and onto Buckingham Palace.
Watch the dramatic video to relive the stunning royal pageantry.