Clearly faced with a difficult dilemma (what do you buy the man who has everything?) the Duchess of Cambridge booked her hubby a light-hearted treat, which he enjoyed in Anglesey last week.
According to the Telegraph, the Prince 'roared with laughter' as he was carted off at high speeds behind the boat off the Welsh coast, and returned 'soaked to the skin' after his sea-faring experience.
'For most 30-year-olds who have just inherited £10 million, the last thing they would want to do is freeze themselves on a wet weekend in Wales,' one royal insider told the Sun. 'But this is typical of William."
It's thought Prince William's birthday escapade was watched by wife Kate Middleton, and a 12-strong party of friends and family, which included Prince Harry and Pippa Middleton, as well as Prince William's oldest pals Thomas van Straubenzee, Harry Aubrey-Fletcher and David Jardine Paterson and Guy Pelly.
Clarence House refused to confirm the exact nature of Prince William's birthday celebrations, simply commenting: 'He’ll be spending it in a low-key, private fashion'.
Yesterday it was revealed the Queen gave Prince William a cottage on her favourite Sandringham for his landmark birthday, while Kate Middleton is reported to have given him a Nicky Phillips portrait of herself, costing £25,000.
What are your thoughts on Kate Middleton's birthday gift to Prince William? What do you buy the Prince who has everything? Let us know in the comments box below…