Riddikulus! Harry, Kate and William Cast a Spell

Wand erection. What do you think Kate Middleton's patronus is?

LONDON, ENGLAND - APRIL 26: Prince Harry, Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge raise their wands on the set used to depict Diagon Alley in the Harry Potter Films during the Inauguration Of Warner Bros. Studios Leavesden on April 26, 2013 in London, England. (Photo by Chris Jackson - WPA Pool/Getty Images)

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