The Princess Royal has topped a table of days worked by members of the monarchy so far this year - completing twice as many as most of the Royal Family.
Anne, who has a reputation for hard work, worked 114 days and was followed by the Prince of Wales with 93 and the Duke of York who notched up 71.
At the bottom of the table was the Duchess of Cambridge with 39 days, and the Duke of Cambridge and Prince Harry both with 46.
The figures were compiled by the Press Association from the Court Circular, the official listings of royal engagements.
The research also revealed the Queen completed 50 days while the Duchess of Cornwall completed 51, the Duke of Edinburgh 52 and Earl of Wessex 55.
William, Kate and Harry will be carrying out a string of royal engagements next week with the Duke of Cambridge celebrating England's under-20 World Cup football champions, while Harry will meet trainee coaches at Manchester City Football Club's ground. William, who finished his job as an air ambulance pilot this summer, has pledged to make issues facing the emergency services a focus of his work for many years to come.
On Monday, Kate will visit the Hornsey Road Children's Centre, an institution in London which supports families.