Witness is the fifth studio album by American singer Katy Perry. It was released on June 9, 2017, by Capitol Records. Four singles aided the album's release: "Chained to the Rhythm" featuring Skip Marley on February 10, "Bon Appétit" featuring Migos on April 28, "Swish Swish" featuring Nicki Minaj on May 19, 2017, and "Hey Hey Hey" on January 12, 2018. Witness received mixed reviews from music critics. It topped the charts in Canada, Spain, and the United States while reaching number two in Australia, South Korea, Mexico, and New Zealand and the top five in 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 Katy Perry Live: Witness World Wide. She also embarked on Witness: The Tour in support of it.