Blondes may have more fun, but if you want to get on in life - dye your hair brown. Researchers carried out a study of 3,000 women and found on average brunettes will earn £4,250 more a year than blondes. And it's not only in their chosen careers that brunettes will be more successful - they are also luckier in love too.
Almost half (44 per cent) of those with dyed or natural brown hair said the shade gave them the greatest success with the opposite sex - a 10 per cent better hit rate than blondes.
And 20 per cent of brunettes boasted five relationships or more in the past, while only 13 per cent of blondes shared the same amount.
Camila Lobo-Guerrero, of hair colour specialists Schwarzkopf & Henkel, who commissioned the report, said: "It's always assumed blondes have more fun, therefore had more success in their love lives and careers too.
"Our research shows that blondes still do have more fun but aren't taken as seriously as women with darker hair - both at work and play.
"Brunettes are climbing the career ladder quicker as well as having better luck in love which may explain why stars like Catherine Zeta-Jones, Kelly Brook, Kate Beckinsale and Eva Longoria-Parker are so successful.
"Hair colour can not only change your appearance but also change your mindset and people's perception of you too." The Schwarzkopf & Henkel study also showed just how much hair dyeing can influence a woman's outlook on life.
One in seven females admitted that changing their natural hair colour made them feel sexier - with those born with dark hair feeling the most desirable after altering their look.