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GRIMSBY, ENGLAND - MARCH 05: Catherine, Duchess of Cambridge greets children during a visit to the Havelock Academy on March 5, 2013 in Grimsby, England. (Photo Darren Staples - WPA Pool/Getty Images)

GRIMSBY, ENGLAND - MARCH 05:  Catherine, Duchess of Cambridge greets children during a visit to the Havelock Academy on March 5, 2013 in Grimsby, England.  (Photo Darren Staples - WPA Pool/Getty Images)

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The Duchess of Cambridge is greeted by children from Havelock Academy, Grimsby, during her visit to the town. PRESS ASSOCIATION Photo. Picture date: Tuesday March 5, 2013. See PA story ROYAL Kate. Photo credit should read: Lynne Cameron/PA Wire (Photo by Lynne Cameron/PA Images via Getty Images)

The Duchess of Cambridge is greeted by children from Havelock Academy, Grimsby, during her visit to the town. PRESS ASSOCIATION Photo. Picture date: Tuesday March 5, 2013. See PA story ROYAL Kate. Photo credit should read: Lynne Cameron/PA Wire   (Photo by Lynne Cameron/PA Images via Getty Images)

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GRIMSBY, ENGLAND - MARCH 05: Catherine, Duchess of Cambridge waves to the crowd during her visits to the National Fishing Heritage Centre during her official visit to Grimsby on March 5, 2013 in Grimsby, England. (Photo by Danny Martindale/WireImage)

GRIMSBY, ENGLAND - MARCH 05:  Catherine, Duchess of Cambridge waves to the crowd during her visits to the National Fishing Heritage Centre during her official visit to Grimsby on March 5, 2013 in Grimsby, England.  (Photo by Danny Martindale/WireImage)

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GRIMSBY, ENGLAND - MARCH 05: Catherine, Duchess of Cambridge during her official visit to The National Fishing Heritage Centre on March 5, 2013 in Grimsby, England. (Photo by Mark Cuthbert/UK Press via Getty Images)

GRIMSBY, ENGLAND - MARCH 05:  Catherine, Duchess of Cambridge during her official visit to The National Fishing Heritage Centre on March 5, 2013 in Grimsby, England.  (Photo by Mark Cuthbert/UK Press via Getty Images)