Katy Perry has revealed that her new album was set to be released next year.

The US star is due to unleash 'Prism' on October 21 in the UK and a day later in the US - but it wasn't originally planned like that.

Speaking to Billboard, the 'Part of Me' singer admitted that she had so much material that her team were okay with bringing the release date forward. She said:

"In May I sat down with my managers and said, 'Guys, I think I'm going to have everything ready enough to come out this fourth quarter'. We weren't really thinking we'd be able to put anything out until February [2014], but you don't want to sit on something that's about to burst."

Perry added: "I didn't want to do Teenage Dream 2.0. 'Teenage Dream' was highly conceptual, super-pop art. 'Prism' is more organic, au natural, vulnerable and honest, but still has the same amount of fun.