Best of 2011

Remembering Princess Diana on Her 55th Birthday: Images We Can't Forget

She was the most photographed woman in the world. Here, the shots that stand the test of time

The Royal Engagement

In the first photograph of the royal couple, Charles, Prince of Wales, then 32, poses with his fiancée, Lady Diana Spencer, 19, outside Buckingham Palace on Feb. 24, 1981 – just moments after announcing their engagement. Nearly three decades later, Diana's son William proposed to longtime girlfriend Kate Middleton with his late mother's iconic engagement ring.