Kate Middleton uses official YouTube channel to promote her project Entertainment "The Duke and Duchess of Cambridge" official YouTube channel was launched earlier this month. Kate Middleton on Monday shared a new video on the channel which has amassed over half a million subscribers. The video titled 'Forever Holding Hands' introduces the third of a series of telephone calls that The Duchess held with participants from the Hold Still project. Spearheaded by The Duchess of Cambridge, Patron of the National Portrait Gallery, Hold Still is an ambitious community project to create a unique collective portrait of the UK during lockdown.