The couple signed the wedding register in front of witnesses during a 10-minute ceremony costing €600, reports the Daily Mail.
After Alamuddin made her first appearance as Mrs Clooney in a Giambattista Valli haute couture dress on Sunday, the 36-year-old British lawyer chose a simple cream and navy trouser suit paired with a matching wide-brim hat for the final part of the nuptials.
More news on the wedding of the year has also just been revealed. The latest sighting of the happy couple comes after a spokesperson confirmed to WWD that Amal's wedding dress was designed by Oscar de la Renta.
And there's more - Clooney's representatives revealed People magazine has the exclusive rights to their wedding photos.
Originally it was thought Amal would wear a gown designed by Alexander McQueen and Anna Wintour's presence at the wedding also sparked rumours US Vogue would be the first to publish pictures from the day.
In case you missed it, George and Amal said "I do" on Saturday in an intimate but star-studded ceremony at the Aman Canal Grande resort.
The former mayor of Rome, Walter Veltroni, married the couple in a ceremony that was watched by stars including U2 frontman Bono, Matt Damon, Emily Blunt, John Krasinski, Bill Murray, Cindy Crawford and her husband - and Clooney's best man - Rande Gerber.
Until the next sighting of the newlyweds (it must be honeymoon time?) catch up on who was there and what they wore below: