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9. Kim Kardashian and Kanye West - 2014
Estimated Cost: $12 million

Leave it to KimYe to have the wedding to end all weddings. The stars spent a reported $400,000 on the venue (Forte di Belvedere in Florence) alone, while Kim's dress was even more than that, $500,000, supposedly. There was also a marble table at the reception that had a $478,000 price tag, so you can see how things added up fast on this one. Would you expect any less from Kim and Kanye, though?