Katy Perry is planning to have hypnotherapy to give up smoking.

The 'Hot N Cold' singer has reportedly been puffing on more and more cigarettes as her nuptials to British comedian Russell Brand draw closer, but is now planning drastic action to stop the deadly habit before it ruins her singing voice.

According to the Daily Mirror newspaper, the singer told a pal: "I'm stressed out with the wedding and I keep smoking to calm my nerves. I do it even though I know it is really bad for me and I know I need to stop.

"So I'm thinking I am going to have hypnotherapy to help me get over it. I'd never say to kids, 'This is cool'. It's a really bad habit that I need to quit."

Katy, 25, recently confessed that even though she has a successful career worldwide and a famous fiance she can be unsure of herself.

She explained: "Even the most confident people still have their moments of insecurity. And even though I may come across as loud and bubbly and brimming with confidence, I can be a shy girl too."