Lady Gaga and Katy Perry named in Kesha's battle against Dr. Luke
Bristol Palin slams celebrity 'sissies' who won't perform at Trump inauguration
Insiders: Trump team dangled ambassadorships to lure A-list inauguration singers
Katy Perry, Jennifer Aniston and more stars heat up the 'Office Christmas Party' premiere
EXCLUSIVE: Katy Perry sparks Orlando Bloom engagement rumors, rocks massive ring on left hand
Hillary Clinton surprises Katy Perry at UNICEF Snowflake Ball
Taylor Swift, Jennifer Aniston, John Mayer and more -- 7 of the biggest celebrity bombshells from Andy Cohen's new book
Katy Perry cancels performance in China over 'family emergency'
Taylor Swift and Katy Perry step out in NYC wearing matching animal print coats -- who wore it best?
Celebrities rock the vote on election day 2016
Taylor Swift dominates Forbes list of 2016's highest-paid women in music
Social Scene: Celebrities dress up for Halloween
Katy Perry threw an elaborate 'Grease'-inspired sock hop for her birthday -- and it was amazing!
Katy Perry and Orlando Bloom are totally unrecognizable as Bill and Hillary Clinton at Halloween bash
Karlie Kloss shares sultry pic of her and Taylor Swift from Drake's 30th birthday bash
Oh My God, what if Taylor Swift wants to date Drake
31 times Donald Trump has tweeted about pop stars, from Taylor Swift to Katy Perry
Madonna posts topless selfie to announce she's 'voting naked with Katy Perry'
Katy Perry gets arrested for voting naked in new Funny or Die sketch: Watch!
'America's Got Talent' winner Grace VanderWaal gets a sweet surprise from Taylor Swift -- see her adorable reaction!
Katy Perry helped deliver her sister's baby... again!
Ellen surprises Pulse shooting survivor Tony Marrero with the gift of Katy Perry
Miranda Kerr reveals Orlando Bloom warned her about the nude pics and was 'embarrassed'
Katy Perry on 'Catfish' victim who thought they were dating: 'My heart goes out to him'
Style notes: Katy Perry shoe line, Victoria Beckham beauty both coming soon
Orlando Bloom's uncensored nude photos with Katy Perry leaked online -- people are pissed
Britney Spears can't recall ever meeting a 'Taylor Swift'
Orlando Bloom adorably supports girlfriend Katy Perry at Democratic National Convention
Here's the definitive, science-approved list of the most difficult sex acts in music
Greatest Olympic Anthems, From Muse & Whitney Houston to Katy Perry & Freddie Mercury