Blondes have more fun.

In recent months, Kate Middleton has opted to rock a lighter hair color for the first time. Now, after her long, bright blonde locks have made headlines, the Princess of Wales, 43, is confessing her secret.

On Wednesday, Middleton attended the Royal Variety Performance alongside her husband Prince William in London.

While at the concert, the royal told actress Su Pollard what spurred her change in hair color.

The British singer, 76, said she complimented Middleton, telling her: “I like your hair, it looks a lot lighter,” per the Daily Mail .

“It used to be brown, but it’s gone light in the sunshine,” the princess reportedly responded.

In September, Middleton stepped out with William, 43, at the Natural History Museum’s gardens in London, and showed off he

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