Catherine has slowly returned to public events after cancer treatment and had been expected in the procession of Royal Ascot, but she abruptly canceled.

The Princess of Wales had planned to attend the second day of the event on Wednesday, but canceled those plans just moments beforehand.

As for which member of the Royal Family is an expert at picking winners, Harrold noted, "Queen Camilla is very much into horses. The King is, but I would say Camilla is more so, along with Princess Anne. If you're going to be taking advice on which horses, I would look at Camilla for a good tip."