George Clooney and Amal Alamuddin’s marriage has been sealed with a civil ceremony in Venice on September 29.

George Clooney and Amal Alamuddin went by boat to the city hall building where the brief procedure was conducted.

At the weekend, a host of famous guests including Matt Damon and Bill Murray attended a lavish wedding reception for the couple.

George Clooney’s publicist broke the news of their nuptials in a brief statement to the press on Saturday.

The couple emerged from the town hall some 10 minutes after their arrival and were whisked away in a water taxi, surrounded by other boats and watched by well-wishers.

George Clooney and Amal Alamuddin’s marriage has been sealed with a civil ceremony in Venice (photo AP)

George Clooney was dressed in a charcoal grey suit, while Amal Alamuddin wore a smart-casual white outfit and a wide-brimmed sunhat.

At city hall, George Clooney and Amal Alamuddin were officially married under Italian law by former mayor of Rome Walter Veltroni, a long-time friend of the film star.

Earlier in the day, he was seen getting ready for the ceremony at the Hotel Cipriani, where the wedding party have been staying.

George Clooney and Amal Alamuddin were engaged in April.

The actor was previously married to Talia Balsam, who he divorced in 1993.

Lebanese-born British lawyer Amal Alamuddin has defended Julian Assange of WikiLeaks and former Ukrainian PM Yulia Tymoshenko among others.

Amal Alamuddin met George Clooney through her work.

[youtube qwh0yZ3JnLY 650]