India, Sept. 4 -- justify;">The Princess of Wales made a stylish return to public duties as she joined Prince William at the Natural History Museum in London. Kate Middleton, 43, unveiled a noticeably lighter hair color with her brunette locks transformed into a softer blonde shade after the family's Greek summer holiday, reported Daily Mail.

The report added that Kate, who has been a patron of the museum since 2013, appeared elegant in a fitted tweed blazer, white shirt, tailored trousers and brown flats. She completed the look with her Daniella Draper alphabet necklace, engraved with the initials of her children, George, Charlotte, and Louis.

The royal couple toured the museum's newly transformed gardens, where they met schoolchildren...