Ed van Cutsem, the eldest of the four brothers, smiles after his wedding ceremony on Nov. 6, 2004. Van Cutsem and his wife, Lady Tamara Grosvenor, who is the eldest daughter of The Duke and Duchess of Westminster, are expected to be at the royal wedding.
Pictures: Prince William and Kate Middleton
Pictures: What to wear to a royal wedding
Special section: Britain's royal wedding
Credit: MJ Kim/Getty Images