Kate, 43, was accompanied by her husband, Prince William , also 43, and two of their children, Prince George, 11, and Princess Charlotte, and London's All England Club.
While Prince William was studying at Eton, Kate Middleton, a boarder at Marlborough College, was rumoured to have posters of the prince on the walls of her dorm.
Eamonn Kelly, who sells the newspaper in Cambridge, told The Telegraph that his meeting with Prince William had a momentous impact on him and ultimately led him to shake a drug use habit.
In the strongest indication yet that Prince Harry is keen for a reconciliation with the King and other senior Royals, it is understood that an emailed invitation will be sent out later this month.
As Prince William celebrates his 43rd birthday today, he is still as well-loved by the public as he was at 15. And a recent YouGov poll revealed he is now the most popular living royal.