Cost: $1.5 million
The wedding took place at Scotland's Skibo Castle, where the couple booked all 21 rooms of the estate for guests, including Gwyneth Paltrow, Rupert Everett, Sting and Trudie Styler. Madonna wore a strapless, cream silk gown by Stella McCartney, accessorized with a 1910 diamond tiara once worn by Princess Grace Kelly of Monaco. The pop star and her film director hubby danced the night away with guests in a basement converted into a disco.