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Watch: Prince William says Princess Charlotte had a 'lovely' birthday
The Duke and Duchess of Cambridge have launched their own YouTube channel, sharing a cheeky clip in which Prince William warns Kate "be careful what you say".
The royal couple had previously shared their video content on their social media pages and on the Royal Family YouTube channel, which manages the work of all the working family members.
But on Wednesday they shared details of their own YouTube channel, encouraging followers to like and subscribe.
In a video to welcome people to their page, the duke, sitting next to his wife on a sofa, pointed at the camera and said: "You've got to be careful what you say now, because these guys are filming everything."
Kate laughed as she replied: "I know."
The video then cut to a series of clips of their work and visits over the last few years, including everything from glamorous gala dinners to mucking out on farms.
It also showed an outtake from their video for St Patrick's Day, with Kate telling William: "You don't need to roll your Rs."
The Queen made an appearance at the end, as the couple used a clip of them showing her around Kate's garden at the Chelsea Flower Show back in 2019.
Responding on Twitter to their announcement, YouTube replied: "*rolls out the red carpet*".
The couple also changed their handle on Instagram, switching from Kensington Royal to dukeandduchessofcambridge.
They updated it with a new picture too - choosing an image from their trip to Ireland in March 2020.
The couple was there for their first official visit just before the UK went into lockdown to combat the spread of coronavirus.
The picture was taken as they reached the top of the cliff walk in Howth, and shows Kate laughing with William as they have their arms wrapped around each other.
The YouTube channel, which hit 44,000 subscribers within the first two hours, has already been stocked up with past clips, including many of the Zoom calls they have been making over the last 13 months in lockdown.
They have sectioned them into categories, featuring mental health, early years, and engagements.
Early Years is the main focus for the duchess, who launched a project studying development in under-fives last year, including a huge national survey.
Kate, 39, is set to reveal more about the project and her plans this year.
Mental health has been an important area of work for both the duke and duchess for several years, and they launched the Heads Together scheme in 2017 with Prince Harry, when he was a senior royal.
They have not been able to carry out as many engagements as usual over the last year because of various lockdowns, but as the youngest working royals, they have been the first out at each available opportunity.
The launch of the channel, and the change of picture, is likely to draw comments about their need to remain visible and relatable in the coming month and years.
The couple are more relied upon than ever in the Royal Family, since Prince Harry and Meghan Markle stepped back and moved to the US.
Amid the pandemic, William and Kate were also the lowest risk when it came to in-person engagements and so have been seen in public much more frequently than older family members.