Amazon tycoon Jeff Bezos, 61, and his fiancee Lauren Sanchez, 55, kicked off a three-day wedding celebration with guests including Kim and Khloe Kardashian, and Oprah Winfrey, reported AFP.

The sumptuous, secluded ceremony attended by celebrity friends on an island in Venice’s lagoon, comes amid local criticism over its extravagance and ecological impact.

Venice, home to the oldest film festival in the world, is used to VIPs whizzing around in speed boats, and happily hosted the star-studded nuptials of Hollywood actor George Clooney in 2014.

But Bezos – one of the world’s richest men and founder of a company regularly scrutinised for how it treats its workers – is different. And the festivities have sparked protests from environmentalists and locals who accuse authorities of pandering to the super rich while the city drowns under tourists.

Wedding guests snapped by paparazzi as they hopped into boats included Jordan’s Queen Rania, US football player Tom Brady, American fashion designer Spencer Antle, singer Usher, and Ivanka Trump – the daughter of US President Donald Trump.

The celebrations are set to end on Saturday with a party likely at the Arsenale, a vast shipyard complex dating back to when the city was a naval powerhouse.

Bezos and Sanchez are donating three million euros ($3.5 million) to the city, according to Veneto’s regional president Luca Zaia, and are employing historic Venetian artisans.

Venice’s oldest pastry maker Rosa Salva is baking 19th-century “fishermen’s biscuits” for party bags which will also contain something by Laguna B, renowned for its handblown Murano glass.

Trump and her family visited a glass-blowing workshop on the small island of Murano on Wednesday, according to the owner.

Some locals say the A-list guests and their entourages bring good business but critics have accused billionaire Bezos of using the UNESCO site as his personal playground.

And environmental activists have also pointed to the carbon footprint of the mega yachts and dozens of private jets bringing the rich and famous to the canal city.