Katy Perry underwent "a lot of therapy" following her split from Russell Brand.

The couple's marriage fell apart just 14 months after they tied the knot in India and they were officially divorced last year (12).

Perry has since moved on with fellow musician John Mayer, but admits she spent a long time dealing with personal issues in the aftermath of her marriage breakdown.

The singer reveals she underwent therapy sessions to help her deal with her emotions and even poured her angst into new song Roar.

She tells Britain's Radio 1, "This new song is called Roar. It's a bit of a self-empowering type of song. I wrote it because I was sick of keeping all these feelings inside and not speaking up for myself, which caused a lot of resentment.

"Obviously I've been through a lot of therapy since my last record and that's what this is about."