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Most Outrageous Weddings

Something lavish, something diamond, something Hollywood—and many things new.

Such is the refrain of today's outrageous weddings, where celebrities and heirs to vast fortunes marry in over-the-top nuptials with price tags in the millions.

"This is definitely something that could be perceived as a publicity stunt," said Anja Winikka, site director at the wedding website TheKnot.com. "There's celebrity spending on nuptials as compared to average couple spending, and then there's these outrageous weddings that spend over the top amounts of money. You have to ask yourself why spend that much?"

Many times couples will rent out an entire property for their venue to ensure privacy and find a creative space.

Others spend big bucks to pull off elaborate multi-day affairs, such as the planned three-day New York celebration for 83-year old billionaire investor George Soros starting Friday that will be attended by more than 500 guests, including hedge fund titans and prominent political leaders.

These pricey celebrations stand in stark contrast to the average U.S. wedding, whose budget was $28,427, according to the latest TheKnot.com survey last year.

Winikka listed several of the top trends at these extravagant weddings, including "lots of expensive flowers covering every surface," gold, diamonds, and brides that "tend to have very pricey dresses and many of them, as well as jewelry dripping in diamonds and the like."

Click ahead to see some of the more outrageous and over-the-top weddings.

Learn more about the #SuperRich during CNBC's new primetime series "Secret Lives of the Super Rich" premiering Wednesday, September 25 at 9 PM/ET. To see a preview of the series and a celebrity party planner's race to complete a mega-wedding, click here.

—By CNBC's Katie Little. Follow her on Twitter @Katie_Little_

Erik Isakson | Rubberball | Getty Images