3. Pierce Brosnan and Keely Shaye Smith - 2001
Estimated Cost: $1.5 million
An Irish castle (Ballintubber Abbey) is where the former James Bond star had his big day. The highlights included a reception at yet another castle, a 7-tier cake modeled after the one served at John F. Kennedy's wedding to Jackie O, and an ice sculpture commissioned by the bride for her new groom.