Global environmental lobby Greenpeace added its voice on Monday to protests against this week's celebrity wedding in Venice between American technology billionaire Jeff Bezos and journalist Laura Sanchez.

The event, expected to attract some 200 guests including U.S. President Donald Trump's daughter Ivanka and son-in-law Jared Kushner, as well as scores of stars from film, fashion and business, has been dubbed "the wedding of the century."

But some locals see the celebration as the latest sign of the brash commodification of a beautiful but fragile city that has long been overrun with tourism while steadily depopulating.