Katy Perry

Katy Perry has recently declared that she doesn’t feel one hundred percent confident about her latest hits.

"You can never be too sure because it doesn't always work out like that," she admitted to MTV News, when quizzed about whether her new album Prism might beat the success of her previous record Teenage Dream. "But for me I've always kind of gone with my intuitive feeling - if something really moves me, if I get those goose bumps or chicken pox, if I get those then I know it struck a chord in me." Nevertheless, Katy is one of the most popular artists in the United States, her 2010 album, “Teenage Dream”, producing five number one singles.

"I started the record in November, but things were really flowing by the spring and it's a song about standing up for yourself," she said. "Who can be the biggest bully in the equation is yourself and can get in your way and it's a song about speaking up for yourself and having the strength."

Her latest lyrics were inspired by her break from Russell Brand. She is now in a relationship with musician John Mayer.

'For a while, even though I was coming off as totally with it, professionally and everything, maybe I was a little immature personally,' Katy previously told Access Hollywood. 'And so I finally just started garnering strength, and that's [when] I wrote [Roar]. [It's] about becoming stronger and speaking up for myself and making myself roar, essentially