Hollywood heartthrob George Clooney and Lebanese-British lawyer Amal Alamuddin have married in Venice and look set to party the night away with their A-list friends in one of the most high-profile celebrity weddings in years.

“George Clooney and Amal Alamuddin were married today (September 27) in a private ceremony in Venice, Italy,” Clooney spokesman Stan Rosenfield said on Saturday.

The announcement came as a surprise as the pair were not expected to officially tie the knot until Monday.

• In pictures: Wedding of the century

The happy couple in recent times.

Earlier in the evening, a euphoric-looking Clooney swept up Venice’s Grand Canal to attend his wedding party, accompanied by some 20 boatloads of paparazzi and the screams of adoring fans.

Hundreds of camera flashes lit the water around him as the world’s most eligible bachelor prepared to exchange vows with his British fiancee.

The silver-haired actor and director, in an Armani tux, grinned and rubbed his hands in glee as he entered the seven-star Aman hotel’s grand entrance to celebrate with Hollywood chums who have flown in from across the globe for the party.

Matt Damon, Bono, Cindy Crawford and her husband Rande Gerber – rumoured to be Clooney’s best man – glided up the canal ahead of him with dozens of other guests, waving to the crowds and showing off snazzy Versace, Gucci and Prada gowns.

Clooney’s 36-year-old bride was not seen before the party but had been snapped Friday evening in a red gown at a soiree with close friends including actress Ellen Barkin – who threw the human rights lawyer a hen party several weeks ago.

Tantalising details have emerged of the wedding dinner, with stars reportedly to dine on lobster, wild mushrooms and figs at a banquet fit for the gods.

Clooney said goodbye to bachelorhood Friday night with a stag party at his favourite restaurant, just hours after sweeping into the floating city with Amal aboard a water taxi dubbed “Amore”.

After shaking off the paparazzi, Clooney and his chums headed to Da Ivo near Saint Mark’s Square for the venue’s prized Venetian and Tuscan delicacies.

The feasting continued Saturday evening in the garden of the 450-year-old Palazzo Papadopoli, where guests were met with lashings of bubbly and canapes, including polenta with wild mushrooms and prosciutto ham with figs, according to a source.

The 53-year-old actor had 100 cases of his own tequila label flown in for his wedding and was expected to have cracked open bottles of the award-winning tipple at the party.

The Aman’s restaurant is expected to be turned into a nightclub where they’ll dance the night away, with Lana Del Rey reportedly preparing to serenade the couple and Clooney dedicating the song “When I fall in Love” to Alamuddin.

A string orchestra and jazz trio are also expected to perform a number of songs, including “Smoke Gets in Your Eyes”, a ballad made famous by The Platters in 1958.

Clooney, who has owned a home in northern Italy for years, was married once before, to “Mad Men” actress Talia Balsam, but the pair split in 1993, just before his breakout role in “ER” propelled him to the status of global sex symbol.

Alamuddin’s rights work has involved representing Wikileaks founder Julian Assange.