William larks around on a boat in Ibiza with Kate and the Middleton clan in never-before-seen pictures

Taken in 2006, these photos capture a fleeting moment in the lives of the pair when they could behave like ordinary twentysomethings, unencumbered by the responsibilities they now have. They show the Prince (in red shorts) larking around with Kate (to his right) and Pippa, the girls' mother Carole (in green bikini) and their brother James on a boat belonging to Carole's brother Gary Goldsmith during a week-long sunshine holiday to Ibiza. Pippa shows off her athletic prowess with a backwards dive into the sea.