Diana, by her sons
Millions remember her as the fairy-tale royal bride or revealing how "there were three of us in this marriage".
But for her two sons, Priness Diana will always be a mischievous mother, whose love of life and fun was infectious. And now Princes William and Harry have spoken for the first time about Diana as a mother in a documentary to be shown later this month on the 20th anniversary of her death.
Prince Harry says: "This is the first time that the two of us have ever spoken about her as a mother. She was our mum. She still is our mum.
"And, of course, as a son I would say this, she was the best mum in the world. She smothered us with love, that's for sure. She was one of the naughtiest parents."
In Diana, Our Mother, Prince William adds: "She was very informal and really enjoyed the laughter and the fun," says William.
The two princes are shown leafing through a photograph album and studying a photo of Diana holding him while pregnant with Harry, William says: "Believe it or not, you and I are both in this photo, you're in the tummy!"
The show will broadcast on UTV later this month