Prince Harry is Best Man at his brother's wedding.
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Celebrity Best Men And Bridesmaids

6. Prince Harry is Best Man at his brother's wedding.
No-one knows you quite like a sibling. Prince William and his wife-to-be certainly agreed on that point. Just as Kate picked her sister Philippa to be her Maid of Honour, Prince William wanted his younger brother Harry right by his side for the most important day of his life. Harry opted for a traditional outfit for his brother's wedding and chose to wear his Blues and Royals Ceremonial Uniform. The Prince looks very dapper indeed in the deep blue uniform with gold brocade.