1. David and Victoria Beckham - 1999
Estimated Cost: $800,000 ($1.2 million today)
The Beckhams said "I do" at a castle in Dublin with 250 guests. Elton John performed at the ceremony and then guests enjoyed a cake that was topped with nude figurines of the bride and groom, of course. She wore a Vera Wang gown with an impressive 20-foot train and David wore a white Antonio Berardi suit, while four-month-old son Brooklyn wore a matching one. Oh, and they also sported matching purple ensembles at the reception.