LONDON, UNITED KINGDOM - OCTOBER 10: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the World Mental Health Day celebration with Heads Together at the London Eye on October 10, 2016 in London, England. (Photo by Max Mumby/Indigo/Getty Images)
LONDON, UNITED KINGDOM - OCTOBER 10: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge and Prince Harry attend the World Mental Health Day celebration with Heads Together at the London Eye on October 10, 2016 in London, England. (Photo by Max Mumby/Indigo/Getty Images)
LONDON, UNITED KINGDOM - OCTOBER 10: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge attends the World Mental Health Day celebration with Heads Together at the London Eye on October 10, 2016 in London, England. (Photo by Max Mumby/Indigo/Getty Images)
LONDON, UNITED KINGDOM - OCTOBER 10: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge attends the World Mental Health Day celebration with Heads Together at the London Eye on October 10, 2016 in London, England. (Photo by Max Mumby/Indigo/Getty Images)
LONDON, ENGLAND - OCTOBER 10: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend the World Mental Health Day celebration with Heads Together at the London Eye on October 10, 2016 in London, England. (Photo by Chris Jackson/Getty Images)
