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The royal, 20, who is 16th in line to the throne, has been spotted getting stuck in at the Berkshire event - where her parents are also in attendance as spectators.
The Diary continues to provide readers with terrific tales, including the following classic yarns from our archives…
While the Middleton family cut ties with the mail-order Berkshire-based business, Party Pieces, which went into administration last year, Pippa has not been deterred from the party business altogether.
One royal expert has spoken out on Meghan Markle's decision to not join Prince Harry in the UK next week.
Sophie, 59, who is the Patron of the London College of Fashion (LCF), met with postgraduate students at the new East Bank campus in Stratford's Queen Elizabeth Olympic Park today.