Katy Perry has revealed the trick to making her packed schedule work - no boyfriends.

Juggling a packed tour schedule along with filming commitments for American Idol, something had to give.

And for Katy Perry, single following her break-up with Orlando Bloom, her love life was the obvious choice.

'I'm a bit younger in heart! I'm a bit more mature...single!' a laughing Katy said, when asked about how she makes American Idol work with her tour schedule.

'You know, when you're single, you got a lot of time to yourself and a lot of energy, and I'm just finding a delicate balance.'

But having been paid $25million for her Idol gig, she needs to give producers their money's worth.

By contrast, Charlie Puth recently revealed he turned down a role on American Idol because the schedule was 'too overwhelming '.

The We Don't Talk Anymore hitmaker admitted he was 'honoured' to be asked to be a judge on the talent show, but said he had to turn it down.

Charlie shared: 'The schedule got too overwhelming. ABC is wonderful and I told them I would love to be in business with them in the future.”