George Clooney and Amal Alamuddin were forced to switch their wedding venue.

The couple - who are due to formally tie the knot on Monday (29.09.14) after a weekend of celebrations - reportedly had their hearts set on a ceremony at the luxurious Hotel Cipriani in Venice but lost out to Italian businessman, Mauro Marchiaro and his fiancee Barbara Ciocca.

A hotel spokesman confirmed to The Sun: ''We have an event on Saturday that was pre-planned and we also have events for George Clooney's party.''

Mauro's mother added: ''We were all just looking forward to a nice quiet wedding but now we have George Clooney to contend with. It's going to be a nightmare.''

Meanwhile, 53-year-old George and Amal, 36, are expected to wed at the seven-star Aman Hotel today (27.09.14) before returning to Hotel Cipriani for a party, complete with fireworks.

The bride and groom and their guests have reportedly booked 70 rooms at the five-star hotel for the ''three-day wedding extravaganza'', costing them more than £250,000.

The couple have already been joined by Matt Damon and his wife, Luciana as well as Cindy Crawford and her husband Rande Gerber, who is rumoured to be taking on the role of best man.

U2's Bono, Cate Blanchett, Brad Pitt, Angelina Jolie and other celebrity guests are expected join the couple to celebrate the big day.