Katy Perry appeared on SNL last night as the musical ... The song features Swedish DJ Alesso, who has worked with artists such as Hailee Steinfeld, Tove Lo, Liam Payne, and more.

Katy Perry’s “Cozy Little Christmas” rises to a new peak on the Billboard Global Excl. US, standing out as her second-highest ...

"Everyone’s saying he doesn’t look like himself." ...

Katy Perry's new single "Woman's World" debuts below ... She joined DJ and producer Alesso on his single “When I’m Gone,” which became a minor and momentary win on the chart.