Even bottle blondes have more fun (but brunettes make better friends)

Unnatural attraction: Even bottle blondes have more fun (but brunettes make better wives and friends)

4:42 PM on 12th October 2011

Blonde ambition: Cheryl Cole has seemed happier since she started dying her hair blonde Natural look: Cheryl as she used to look, with darker hair

Blonde ambition: (left) Cheryl Cole has seemed happier since she started dying her hair blonde (right) Cheryl as she used to look, with darker hair

TO DYE OR NOT TO DYE

Chameleon: Eighty per cent of women think brunettes, like Katy Perry (pictured with Russell Brand), make better wives

Chameleon: Eighty per cent of women think brunettes, like Katy Perry (pictured with Russell Brand), make better wives

Back to blonde: Katy loves having light hair and regularly returns to the look Back to blonde: Katy loves having light hair and regularly returns to the look

Back to blonde: Katy loves having light hair and regularly returns to the look