The Fab 4 are reunited and it's for an amazing cause. Both the Cambridge's and the Sussex' are strong advocates for mental health and now together, they have voiced a PSA video for mental health as part of a campaign launched by Public Health England for their Every Mind Matters program. The three-minute clip features all four royals narrating a spot. 

Every Mind Matters- Fab 4

Other celebrities in the video are Gillian Anderson, Glenn Close and the Great British Bake Off winner, Nadiya Hussain. The video will be aired by major U.K. broadcasters on Monday evening, October 7th. A royal source spoke about the reuniting, "when they heard about it, all four of them were really keen to take part. It is a really positive project, and all four of them have been involved and they hope it will have a huge impact."