Photos: Prince William, Harry and Kate mark the 20th anniversary of the death of Princess Diana

Today marks the 20th anniversary of the death of Princess Diana who died on August 31, 1997 after a car she was traveling in crashed at the Pont de l'Alma tunnel in Paris. She was just 36 years old.

To mark the 20th anniversary of her death, her sons; Princes William and Harry paid tribute to their mother on the eve of the 20th anniversary of her death by visiting a memorial garden at Kensington Palace where thousands of people have stuck posters to the iconic gates of and left bunches of flowers to remember the Princess.