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WATFORD, ENGLAND - APRIL 26: Catherine, Duchess of Cambridge attends the inauguration of Warner Bros. Studio Tour London on April 26, 2013 in Watford, England. (Photo by Karwai Tang/WireImage)

WATFORD, ENGLAND - APRIL 26:  Catherine, Duchess of Cambridge attends the inauguration of Warner Bros. Studio Tour London on April 26, 2013 in Watford, England.  (Photo by Karwai Tang/WireImage)

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WATFORD, UNITED KINGDOM - APRIL 26: Catherine, Duchess of Cambridge visits Warner Bros Studios on April 26, 2013 in Watford, England. (Photo by Samir Hussein/WireImage)

WATFORD, UNITED KINGDOM - APRIL 26:  Catherine, Duchess of Cambridge visits Warner Bros Studios on April 26, 2013 in Watford,  England. (Photo by Samir Hussein/WireImage)

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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 Paul Rogers - WPA Pool/Getty Images)

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 Paul Rogers - WPA Pool/Getty Images)