"I kind of went on a cleanse."
The songwriter cashes in major favors for her debut.
See the pop star's craziest, sexiest, and most glamorous fashion moments.
It's a tour de force of trash talk.
They call him Bang Bang. And they get to draw their own permanent ink on his leg.
The 17-year-old Chicago rapper didn't play nice, but Perry did.
Katy Perry thinks she's on Game of Thrones, Beyoncé and Madonna fight over first-name supremacy, Anna Wintour presides, and more.
Sarah Jessica Parker, Anne Hathaway, Allison Williams, and other women who looked both awesome and on-theme (somehow).
It was adorned with a halo of purple flowers.
Beyoncé, Rooney Mara, and of course, Kimyembryo.
While promoting her new fragrance, fittingly called "Killer Queen."
It looks rather regal.
Plus pictures of Carey Mulligan, Miuccia Prada, and others from last night's shindig.