"Special Royal Correspondent" for Inside Edition
Amanda follows the route that Meghan Markle and Prince Harry will take as husband and wife for the first time.
Amanda set off for the nearly three-mile procession through historic Windsor, where spectators will get a clear view of the newlyweds.
The carriage ride is expected to last about 25 minutes.
"The crowds are already starting to buzz," Holden said. "There are so many people around."
Holden, a judge on "Britain’s Got Talent," was recognized by pedestrians as she tested out the route. She posed for photos and said hello to fans as she carried on.
The route is already adorned with messages to the newlyweds.
The couple’s journey will end right where it started, at Windsor Castle.
After the carriage ride, the reception will begin inside the castle, where the honored and distinguished guests will celebrate the couple.