Known as the Lotus Flower Tiara, the crown jewel that Palace insiders say was loaned to the Duchess of Cambridge by Queen Elizabeth from her collection dates back to the Queen's mother in the 1920s.
"It's a beautiful pearl and diamond piece," expert Leslie Field, author of The Queen's Jewels, says about the Egyptian-style tiara, which was also previously owned and worn by the Queen's late sister, Princess Margaret.
Wearing a sparkling diamond tiara for the first time since her 2011 wedding, the new mom paired it with diamond earrings and a white lace dress.
Her husband also looked dashing in a white tie and tails.
The delicate fan motif tiara, which is made of diamonds and pearls, is the same tiara worn by the late Queen Mother when she was Duchess of York in the 1920s.
Kate Middleton, supposedly due to give birth today, is on the move.
The British are getting tired and fed-up with the ever-maneuvering Middletons, especially with Mamma Carole Middleton, who is now trumpeted by none other than "Tattler Magazine" (a very upper-crust fusion of Vogue and The Enquirer) as being the new "power behind the throne," due mostly to her insistence upon controlling William and Kate, and now getting her talons into the new royal baby.
Quick, quick, hurry, hurry!
Duh, duh, duh!