Katy Perry following her ex-husband Russell Brand's transition from comedy work to activism, and released a concert film titled "Katy Perry: The Prismatic World Tour" through Epix, which took place during her tour of the same name. Perry also made a cameo appearance in the music video for Madonna's song "Bitch I'm Madonna" in June 2015. The following month, she released another fragrance with Coty, entitled Mad Potion. In September 2015, she appeared in the documentaries "Katy Perry: Making of the Pepsi Super Bowl Halftime Show", which followed Perry's preparation for her Super Bowl performance, and "", which followed the life and
Witness (Katy Perry album) nine other nations. To accompany the album's release, the singer broadcast herself for four days on YouTube with a four-day live-stream titled . She also embarked on in support of it. Following the release of her fourth album "Prism" in 2013 and the end of the Prismatic World Tour in October 2015, Katy Perry told "The New York Times" in February 2016 that she was in the "research and development phase" of a new album. She decided to take a hiatus after the tour concluded to "give my mental health a break" before starting to write new songs the following