Katy Perry suffered with "bouts of situational depression".



The 'Dark Horse hitmaker admits her "heart was broken" last year when there was a mixed response from the public to her album 'Witness' and she has been working hard to improve herself.



She said: "I had bouts of situational depression. My heart was broken last year because, unknowingly, I put so much validity in the reaction of the public, and the public didn't react in the way I had expected to. Which broke my heart."



And the singer decided to go to the Hoffman Institute in California to give her "a new foundation."