VENICE: U.S. actor George Clooney and Lebanese-born human rights lawyer Amal Alamuddin formalized their marriage in a civil ceremony in Venice on Monday, capping star-studded weekend nuptials.

The two, who married at a lavish party on Saturday night, spent about 10 minutes inside the lagoon city's 14th century city hall for a civil service registering their marriage.

It was presided over by former Rome mayor and close friend, Walter Veltroni.