LONDON, ENGLAND - FEBRUARY 17: Catherine, Duchess of Cambridge poses with Solei Neil-Brown, Kiera Mullins, Haydan Pearce and Joshua Hogan, children from the 'Real Truth' video blog that features on the Huffington Post website at Kensington Palace on February 17, 2016 in London, England. The Duchess of Cambridge is supporting the launch of the Huffington Post UK's initiative 'Young Minds Matter' by guest editing the Huffington Post UK today from Kensington Palace. (Photo by Chris Jackson/Getty Images)

LONDON, ENGLAND - FEBRUARY 17:  Catherine, Duchess of Cambridge poses with Solei Neil-Brown, Kiera Mullins, Haydan Pearce and Joshua Hogan, children from the 'Real Truth' video blog that features on the Huffington Post website at Kensington Palace on February 17, 2016 in London, England. The Duchess of Cambridge is supporting the launch of the Huffington Post UK's initiative 'Young Minds Matter' by guest editing the Huffington Post UK today from Kensington Palace.  (Photo by Chris Jackson/Getty Images)