As we pay tribute to our No. 25 Greatest Pop Star of the 21st Century, a look back at Katy Perry's imperial era -- which also marked a key transitional period for the music industry.

Katy Perry's 'Teenage Dream' era was a peak for her and for pop music, but it also showed why its moment was about to come to a close.

Katy Perry unveiled the very racy alternate cover for her upcoming album 143 on Thursday — as she desperately tries to salvage her comeback.. For the 'exclusive' cover for Urban Outfitters, the ...

Perry’s next album, 2017’s “Witness,” was a bust by the standards of 2013’s “Prism” and certainly 2010’s blockbuster “Teenage Dream,” which had a record-tying five No. 1 singles.

Beginning with the release of "California Gurls" in 2010, Perry fronted a remarkable streak on the United States charts, with that song and four subsequent Teenage Dream album cuts all reaching No ...

"Teenage Dream" is arguably Katy Perry's signature song. One of the writers did not want to hand the track over to Perry, but she had to because she was desperate.