The couple will leave Westminster Abbey, flanked on both sides by a path-lining party made up of specially selected members of the Armed Forces.
The bride and bridegroom will then depart for Buckingham Palace, accompanied by the Household Cavalry Mounted Regiment.
Prince William asked for the four carriage officers by name after serving with them in the Household Cavalry Regiment. Two of the horses involved today are named after the bride and bridegroom - William and Catherine. Other horses are called Connery, Goliath, Valerian, Viper and St. Valentine.