The most lavish celebrity wedding for a generation has begun with stars arriving to see Lauren Sanchez marry Jeff Bezos at a ceremony and reception set to cost the Amazon billionaire upwards of $20million.

Royals, statesmen and Hollywood glitterati have gathered together in Venice for the Bezos-Sanchez nuptials as one of the world's great cities of love plays host to an event like no other.

Lauren looked stunning as she was whisked by speedboat to San Giorgio Maggiore, which overlooks a Venice lagoon, to walk down the aisle in front of 200 VIP guests.

She wore a classic white suit and headscarf to land on the island where she changed into her handmade, one of a kind Dolce & Gabbana gown.

Amid local protests, the globe's richest and most powerful people have descended on La Serenissima, the Most Serene Republic of Venice, to pay homage to the Amazon billionaire and his blushing 55-year-old bride.