Kate's crown on it's original owner, the Queen Mother. It was a gift from her husband, then passed to Queen Elizabeth, who now has gifted it to Kate (though it's part of the Crown Jewels, so it's not Kate's to give away).
Britain's Queen Elizabeth II speaks at a banquet dinner during the Commonwealth Heads of Government Meeting (CHOGM) in Perth on October 28, 2011. Britain's Queen Elizabeth II opened CHOGM today with more than 50 commonwealth nations leaders attending the three day forum to discuss global and Commonwealth issues, and to agree on collective policies and initiatives. AFP PHOTO / POOL / Ron D'Raine