The duchess showed off a new Charlie's Angels inspired look during a visit to London's Natural History Museum.
The Duchess, wearing a Mulberry dress with CND-style peace symbols on it, attracted plenty of attention as she debuted a new 1970s inspired haircut.
She showed off a new fringe, leading to comparisons with Kate Jackson, the Charlie's Angels actress.
The Duchess addressed the 360 invited guests.
''It is a huge honour to be here tonight. The Natural History Museum has a very special place in the heart of this nation.
''William and I are just two of millions of people who have passed through these doors, and marvelled at the spectacular wonders of the natural world, housed in this beautiful gallery."
The duchess's new hairstyle with a heavy parted fringe, has drawn comparisons to Princess Diana's trademark flick hairstyle by many style websites.
Her hair also appears a shade darker than before and is believed to be created by her regular hairdresser Richard Ward, who has a salon off Sloane Square in London.
Kate previously wore the green silk Mulberry dress a year ago at a function in Buckingham Palace.