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Kate Middleton is putting the "blonds have more fun" theory to the test this summer with her brightest shade yet. On Aug. 24, the Princess of Wales was photographed alongside Prince William and their three children — Prince George, 12, Princess Charlotte, 10, and Prince Louis, 7 — during the royal family's annual summer stay at Balmoral Castle in Scotland. Her hair change instantly stole the spotlight: a golden, honey-toned blond that marks her lightest shade to date.

Kate tends to keep a low profile. The last time we saw her was at Wimbledon in mid-July, when she was still rocking her signature brunette with just a hint of caramel. Fast-forward a few weeks, and she's several shades lighter, showing off a sun-kissed blon

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