Most Extravagant Celebrity Weddings

Katie Holmes and Tom Cruise
Estimated Cost: $2 million
The Wedding:TomKat's lavish 2006 nuptials took place in an Italian castle (Odescalchi Castle in Bracciano, if you're wondering). The Scientology ceremony was attended by their A-list buds, including Will Smith and Jada Pinkett Smith, and David and Victoria Beckham, who watched Holmes walk down the aisle in a Giorgio Armani gown and feasted on a five-tiered white chocolate wedding cake. What's priceless?
Most Outlandish Detail: Cruise serenaded his new bride with "You've Lost That Loving Feeling," Top Gun-style.