On Friday, the couple arrived in Venice, where they're set to celebrate their impending nuptials with at three-day extravaganza. The actual civil ceremony will take place on Monday.
But, before they say "I do," there are toasts to be made and champagne bottles to be popped! On Saturday, when Clooney, 53, and Alamuddin, 36, will be escorted by police boats from the Cipriani hotel to the Aman hotel, where a big pre-wedding bash will take place. Reports have claimed that A-listers including Brad Pitt and Angelina Jolie, Matt Damon, Sandra Bullock and Bono will be on-hand, as will Rande Gerber, who is said to be serving as Clooney's best man, and Alamuddin's sister Tala, who is likely one of her bridesmaids.