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The bride's dress has been designed by U.S.-based, Lebanon-born designer Reem Acra, whose gowns have shown up on the red carpet on many stars, including Angelina Jolie and Jennifer Lopez.
For Soros, who has a net worth of $20 billion according to Forbes, this will be his third marriage. It will be the second for Bolton.
When asked if there is a prenuptial agreement, the source familiar with the wedding arrangements said that Soros's lawyer, William D. Zabel, reiterated his comments from last year that "Soros will leave the bulk of his estate to charity but he intends to provide generously for his wife."
In 2011, Soros, who is an active contributor to politically liberal causes and frequently speaks on world economic events, converted his hedge fund into a family office and stopped managing money for outside investors.
In the past three decades, the Hungarian-born Soros has given away more than $7 billion to promote democracy, foster free speech, improve education and fight poverty around the world, according to his foundation's website on www.opensocietyfoundations.org.
Soros was divorced from Annaliese Witschak in 1983 and Susan Weber Soros in 2005.
Chef Bo Bech of the Geist Restaurant in Copenhagen will prepare the food. Soros and Bolton first dined at Geist when visiting Copenhagen in 2009.
The reception on Saturday night will feature Hungarian composer and conductor Iván Fischer, a family friend, who created a new arrangement for the occasion, which will be presented with the Budapest Festival Orchestra. Cape Verdean singer Mayra Andrade will perform with the Harris Lane Orchestra. Andrade and Roma ensemble Via Romen will perform at a Sunday brunch.
In lieu of gifts, the couple asked that donations be made to charities including Global Witness, Harlem's Children Zone, National Dance Institute, Planned Parenthood and the Roma Education Fund.