Mila Kunis, Ashton Kutcher and Fergie also attended the concert.
The Los Angeles stop on the pop icon's Rebel Tour was star studded.
'BRAND: A Second Coming' documents the comedian's divorce.
The comedian explains why he split from the famous pop star.
Katy Perry spent a day hanging out with Hillary Clinton in Des Moines, Iowa.
The singer lit up the presidential hopeful's account like a firework, and it was awesome.
The singer took to Instagram to remember her friend who died on Friday.
We've got total Insta-envy.
Bailey most notably worked with Selena Gomez and Katy Perry.
#SheHadMeAtHello
The singer stopped by 'Watch What Happens Live' on Sunday.
The singer tells GQ she's keeping that secret so she "can sleep at night."
She wasn't always center stage.
