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The Pippa Middleton, sister of Kate Middleton the royal bride to be attended the wedding of Lady Katie Percy, eldest daughter of the Duke of Northumberland, to financier Patrick Valentine in St Michael's Church, Alnwick in Northumberland. Pippa, accompanied by Prince Harry's girlfriend Chelsy Davy they walked to the church in the town from the Castle owned by the Duke of Northumberland. The daughter of one of the country's richest aristocrats held the reception at their spectacular Northumberland castle which doubles as Hogwarts in the Harry Potter films. Lady Katie's father is ranked 163rd in the Sunday Times Rich List 2005, with an estimated wealth of GBP300 million.