Prism was released on October 18, 2013, and debuted at number one on the Billboard 200 chart. Four days later, Perry performed the songs from the album at the iHeartRadio Theater in Los Angeles. “Dark Horse” was released as the album’s third single on December 17, 2013, and became her ninth number-one single on January 29, 2014. In 2014, “Birthday” and “This Is How We Do” followed as the album’s fourth and fifth singles, and reached the top 25 on the Hot 100. Additionally, she recorded and co-wrote a duet with John Mayer titled “Who You Love” for his album Paradise Valley. The song was released on August 12, 2014.
Perry began her third headlining tour, The Prismatic World Tour, on May 7, 2014. It started in Europe, and will have continued throughout North America and Oceania before concluding in Europe on March 22, 2015. Perry will perform at the Super Bowl XLIX halftime show on February 1, 2015.