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17. George Clooney and Amal Alamuddin - 2014
Estimated Cost: $4.6 million

Get this: The Clooneys had a lavish wedding in Venice and actually footed the travel bill for their guests. Must be nice, right? They spent nearly $3 million on 95 hotel rooms at the Cipriani hotel, for starters. Amal's Oscar de la Renta gown was $380,000, making George's Amani tux seem like a bargain at $5,000.