The behind-the-scenes special about the singer's four-day Witness World Wide live stream will premiere Oct. 4.
A full-length, behind-the-scenes special about Katy Perry's four-day Witness World Wide livestream will premiere via streaming subscription service YouTube Red on Oct. 4. The singer released a trailer Wednesday (Sept. 27).
The film is called Will You Be My Witness? and gives a look at the creation of the project, as well as the aftermath of Perry being on-camera 24 hours a day, from June 8-12.