updated 07/01/2011 AT 9:00 AM ET
•originally published 07/01/2011 AT 10:00 AM ET
The occasion is hardly going unnoticed in London, where remembrances in the form of cakes, candles, cards and other tributes are being left outside the gates of Kensington Palace, home to Diana before she was killed in a 1997 car crash at age 36.
“She would’ve been so popular still. Everyone would have been here to help celebrate,” Kathy Martin, 49, a childcare worker from Australia, tells the Associated Press. “We’ll never get to see her grow old.”