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Prince Harry, Prince William

Prince Harry, your best man, for William and Kate's royal wedding, is in the house.

And royal tradition is shocked—shocked!

William & Kate's Royal Wedding

"Royal grooms usually have a married male 'supporter' [as best man]," royal expert Angela Rippon tells us. "But Harry is William's best and closest friend, so like any other young man getting married in the 21st century, he wants his best friend to be his best man."

More than a friend and best man, the 26-year-old Harry is, of course, William's younger brother.