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Kate Middleton stepped out with summer highlights and long locks, making it her lightest and longest hair in years

Speculation was sparked in August that the Princess of Wales changed her hair shade during a summer sighting

Princess Kate returned to royal duty with Prince William, visiting London's Natural History Museum for their first outing since the summer break

Kate Middleton is showing off her blonde summer hair as she returns to royal duty.

On Sept. 4, the Princess of Wales, 43, visited the Natural History Museum's newly transformed gardens with Prince William , also 43, for their first joint outing following summer break .

After sparkling speculation of a lighter hair hue during an August sighting, Thursday's outing confirmed that Princess Kate was rocking

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