The show sees competitors take part in a range of events, from show jumping to dressage, along with displays from The King's Troop Royal Horse Artillery and DAKS Pony Club - a ideal day out for our horse-loving Queen.
The show, now in its 75th year, is held annually in the private grounds of Windsor Castle and is the only event of its kind in the United Kingdom to host worldwide competitions in show-jumping, dressage, driving and endurance.
Palace officials have previously said he will attend the wedding if he is well enough.
The Duke looked to be in great spirits, as he remarkably drove himself around the grounds of Windsor Castle, smiling as he chatted with the Queen, who was outside the vehicle. Buckingham Palace said that the Duke of Edinburgh's hip surgery was a planned procedure and that he continues to recover satisfactorily. His daughter, Princess Anne, also shared that her father was "on good form".
Arizona to host NCAA softball tournament regional
Saint Francis earned the No. 4 seed in the regional and is now 39-17 overall after a flawless 16-0 NEC slate. All of the 13 teams in the Southeastern Conference, including Mississippi State, are in the 64-team field.
But even with that forethought, Prince Philip might not be there to celebrate his grandson's marriage to Meghan Markle on May 19.
Four horses will draw the carriage from Windsor Castle through the town center and back for the wedding reception.
Prince Philip was forced to miss the annual Easter mass last month too, which most of the royal family attended.
Prince Philip was spotted out and in good spirits on Friday in Windsor, England.