LONDON, ENGLAND - MARCH 20: Catherine, Duchess of Cambridge makes an official visit to Baker Street Underground Station on March 20, 2013 in London, England. (Photo by Neil P. Mockford/FilmMagic)
LONDON, UNITED KINGDOM - MARCH 20: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge accompanies Queen Elizabeth II and Prince Philip, Duke of Edinburgh on a visit to Baker Street Underground Station to mark the 150th anniversary of the London Underground on March 20, 2013 in London, England. (Photo by Indigo/Getty Images)
LONDON, UNITED KINGDOM - MARCH 20: Catherine, Duchess of Cambridge visits Baker Street Underground Station to mark the 150th anniversary of the London Underground on March 20, 2013 in London, England. (Photo by Karwai Tang/Getty Images)
