Katy Perry has revealed that she "stayed in bed for about two weeks" following her split from husband Russell Brand.
Channeling the pain of her divorce, Katy wrote the song By the Grace of God, which features on her latest studio album, Prism.
"I was down and out, I'd lost hope, all of my confidence had been shattered…the song is very autobiographical," she confessed.
Since the break-down of her marriage in December 2011, the California Girls songstress has found love with singer John Mayer.
The smitten pair, who have been dating for a year, both performed in London at the weekend.
Katy wowed at the X Factor studio belting out her latest hit Roar wearing a tiger-inspired outfit, while John was singing at the O2 arena as part of his world tour.