The Queen revealed she once worked as a ball girl as she made a surprise visit to Wimbledon on Day 10 of the tournament. Camilla, who was joined by her sister Annabel Elliot, met and spoke to a ball boy and two ball girls, as well as staff working at the grounds before heading to the Royal Box to watch the tennis on Centre Court on Wednesday.The Queen asked Larissa, 15, Sean, 16, and Cassie, 16, whose surnames were not given, if they had previously worked at the tennis tournament and if they were enjoying the role. She said: "You have to be very agile.