The Duke and Duchess of Cambridge have announced they are launching a YouTube channel The couple â who recently celebrated a decade of marriage â announced the news in a video posted to their social media channels, which was accompanied by the message: âWelcome to our official YouTube channel!â 7 May 2021 The clip begins with Prince William and Duchess Catherine â who was known as Kate Middleton before her wedding â sat at home together before he turns to her and says: âWe need to be careful what we say now because these guys are filming everything.â It then goes into a compilation of the various royal engagements the couple have carried out over the years.