William and Harry open up about Princess Diana in new documentary

The princes spoke out about their late mother 20 years after she died in a car accident.
2:49 | 07/23/17

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Transcript for William and Harry open up about Princess Diana in new documentary
Welcome back, everyone. Can't get enough of that phrase right there. Prince will qualm and prince Harry are now opening up about their mother. Adrienne has been take a look at the personal stories the princes are sharing. William and Harry both saying they were really nervous sharing this documentary. William vows it will be the last time they speak as openly and publicly about their mother again. She was the people's princess. But for Diana's sons, prince William and prince Harry, she was simply mum. Now,er in lie 20 years since her passing, the two groan princes are sharing their most memories. You and I are both in the photograph. You're in the tummy. Reporter: The candid recollections parapart of a new documentary featuring never before seen images. Her 20th anniversary year seems to be a good time to remember all the good thing about her and hopefully, provide a different side that others have not seen before. When everybody says to me, she was fun, give us an example. All I can hear is her laugh. She was one of the naughtiest parents. She would come and watch us play football and smuggle sweets into our sox. It was like walking back from a football match and having sort of five pacts of starbursts and just the whole shirt was bulging with sweets. Have she organized, when I came home from school to have Cindy krau forth, Christy Turlington and Naomi Campbell at the top of the stairs. I was a 12-year-old boy, had posters on the wall. I was bright red. I think I fell down the stairs on the way out. Reporter: William and Harry poping up about what it was to be the pride and joy of a princess. We felt incredibly love, Harry and I. I'm very grateful that that love still feels there. It was that love that even if she was on the other side of a room, as a son, you could feel it. Just a sweet, sentiment from both sons. Both of them havinging a really great regret not taking more time talking with their mother on the phone that very last phone call the day she died. And all the things they would have said. And the anniversary. 20th anniversary of her death is is August 31st this year. Endearing moments. I love them sharing her sense of humor with the supermodels showing up. That was quite a move. I love how they called her naughty. A naughty mother. She'll never be forgotten. I don't want my son to get ideas we'll have supermodels for him at any point.

This transcript has been automatically generated and may not be 100% accurate.

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