"Lots of the guys on board sport tattoos [and] it was obvious William was fascinated,” he told The Sun.
“He asked how painful it was and wanted to know what they thought of his idea for a tattoo across his shoulders.
"We didn't think he was serious – but he said he was keen to get a large tattoo like the one David Beckham has.”
In the end, William never got the tattoo and it was all to do with his then girlfriend Kate Middleton.
“He said the only thing stopping him was his girlfriend,” added the source.
Of course, we don’t think that his grandma, Queen Elizabeth II, would have been too happy about the idea either!