More than 100 YouTube stars have recorded a video message urging their fans to "stay home" during the coronavirus outbreak.
The video is introduced by entertainer JJ Olatunji, known online as KSI, who has more than 21 million subscribers on the video clip platform.
"We're here looking to spread awareness on the UK government's current advice to stay at home," he says.
The 20-minute video will be posted on YouTube at 16:00 BST.
As well as YouTube stars, footballer Rio Ferdinand, singer Jess Glynne, and Love Island narrator Iain Stirling are among well-known faces to appear.
The idea for the montage came from the Sidemen, a group of British video-makers, which KSI is part of.
Their joint channel has 7.6 million subscribers on YouTube.
The group says any advertising revenue earned from the video will be "donated to the NHS".