Topix — Pink and Katy Perry are pop superstars, but they're also fans...of each other. Both singers are spokeswomen for Cover Girl, so when Pink saw a photo on Twitter of two Cover Girl billboards of herself and Katy right next to each other, she couldn't re... more info

Chorus.fm — *Tegan and Sara (http://www.absolutepunk.net/teganandsara)*'s upcoming tour dates with *Katy Perry (http://www.absolutepunk.net/katyperry)* can be found in the replies. more info

Mercury News, California — Also: Kacey Musgraves is an artist everyone should know about. She's nominated for a best new artist Grammy. more info

L.A. Times - Pop & Hiss — Katy Perry is roaring back to business. more info

Mercury News, California — Grammy nominated pop star to perform at SAP Center on Sept. 22. more info

Consequence of Sound — The Prismatic World Tour kicks off in June. more info

411 Mania — Along with Take That... more info

411 Mania — Thanks to "Dark Horse"... more info

USA Today Music — She kicks off her Prism tour on Jun. 22 and wraps up on Oct. 10. more info

People.com — The singer posts a photo of herself from across the globe more info