1st Battalion Irish Guards St. Patrick's Day Parade [Getty Images]

The Irish Guard's regimental mascot Domhnall waits for the arrival of the Duke of Cambridge, Colonel of the Irish Guards, and the Duchess of Cambridge, for their visit to the 1st Battalion Irish Guards during the St. Patrick's Day Parade, at the Cavalry Barracks, in Hounslow. (Photo by Yui Mok/PA Images via Getty Images)

PA Images Yui Mok - PA Images