For Katy Perry, that friend is Sia. Perry has praised the enigmatic Australian singer-songwriter in a new interview, in which she thanked her “best friend” for supporting her through “some ...

I love Katy Perry. I think I'm going to hang her poster on my wall now." Katy replied: "You're as sweet as pie! Let's write a song together about the subject we know best...for my new record.

“Katy Perry is not like most celebrities today,” said fan Jeannette Valdez, 20, who with her friend Julia Ham, 22, was able to snag tickets to the sold-out event. “Katy is a down-to-earth ...