We're early on in our list, and we're already seeing a trend for islands being purchased by A-list actors. Johnny Depp, as you may have seen in press reports of his most recent court case, has a reputation for spending money more quickly than he earns it. When you consider that he's the star of the 'Pirates of the Caribbean' movies, that's no mean feat. Depp allegedly spends tens of thousands of dollars on wine every month for his personal consumption, but that's far from being the most expensive of his excesses.
In 2004, Depp paid $3.6m to buy Little Halls Pond Cay - right next to Cage's island. The island comes with six pristine beaches of golden sand, all of which Depp named after someone dear to him - two after his children, one named 'Jack' after his most famous character, and one 'Brando' after his acting hero. Depp described the island as 'instant freedom' in an interview with Vanity Fair, going on to call it the most beautiful thing he'd ever seen.