Multi-billionaire Amazon founder Jeff Bezos and Lauren Sanchez have arrived in Venice ahead of their star-studded weekend wedding.

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".

Greenpeace has joined the protests against Jeff Bezos and Lauren Sánchez’s upcoming Venice wedding by unfurling a huge banner in St. Mark's Square.