This week Prince William and Kate Middleton announced their wedding party. To nobody's surprise William chose little brother Prince Harry as his best man, and Kate chose her sister Pippa for maid of honor.
Like William and Kate, lots of brides and grooms choose siblings; sometimes they're famous and sometimes they're not. But here we've rounded up five celebrity bridesmaids, best men, and maids of honor who stood by their famous friends. See if you can guess who they are!