Katy Perry "can't promise" she won't shave her head in the future.

The 'California Gurls' hitmaker thinks that unlike other famous females - including former child star Britney Spears, who infamously shaved her head at the start of her public meltdown in 2007 - she won't go off the rails because she didn't achieve success until she was 23.

She told BBC Radio 2 DJ Steve Wright: "My first record didn't take off until I was 23 so I was perhaps in a different headspace to someone who became successful at a younger age. If you're starting at 14 or 15 your maturity hasn't fully evolved.

"I'm not going to say I won't mess up, because someday I might want to shave my head. But not today because I'll get sunburn! I'm lucky because I have a great support system."

The 25-year-old singer - who is engaged to British comic Russell Brand - also admitted she was glad she took the gamble of waiting for a record deal that suited her ambitions.

She explained: "I had a very strong vision and some record companies didn't like that, but I waited for the right one and took a chance.

"I was lucky because it doesn't always pay off."