The ceremony at the Ca' Farsetti Palace in Venice was short, lasting just about 12 minutes. The couple arrived at the palace on their boat, the "Amore," and both looked happy while wearing their wedding bands.
Alamuddin was the epitome of casual chic in a white dress and matching hat.
The Oscar-winner, 53, and his now wife, 36, had also been married during a private ceremony Saturday for friends and family at the Aman Canal Grande Venice Hotel.
As for today's venue, the Ca' Farsetti is a gorgeous palace facing the Canal Grande and boasts one of the best views in all of Italy. It's also close to the Rialto Bridge.
Clooney and Alamuddin took part in today's legal ceremony in order to make the marriage legal. Italian law stipulates that you have to sign the register at a local town hall in order for the marriage to be valid.
Clooney is known for his great taste and this venue reflected just that. The amazing palace was built in the 13th century by the heirs of Enrico Dandolo, according to a Venice-based website.
Originally the palace had just two floors, with additions made in the mid-1400s. The palace got its current name in the late 1600s when the Farsetti family purchased it.
The palace served as a hotel in the 1800s and was eventually taken over by the city.