Kate Middleton and Prince William (PA Photos)

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Whose wedding? Showjumper Harry Meade and teacher Rosie Bradford, 2010.
Who's the guest? Princess-in-waiting Kate Middleton.
What's she wearing? A stunning royal blue frock, accessorised with an eye-popping hat and Prince William! Try as they might to keep a low profile, Kate and Wills couldn't help stealing the attention when they attended their friends' wedding. (Apparently, Kate had to rub shoulders with three of William's old flames at the ceremony, too.)