The feature marks the 20th year since her tragic death.

The very first trailer for Diana, Our Mother: Her Life and Legacy has been released by HBO and it promises to be an emotional, heartfelt and celebratory look at the life and legacy of Diana, Princess of Wales. The HBO documentary will feature interviews with HRH The Duke of Cambridge and HRH Prince Harry, both of whom talk openly about their mother and pay tribute to the many ways her influence has shaped their lives. In the footage below, you can see Prince William and Prince Harry revel in the memories of their mother as they flick through a private family album that features some of the most joyful and touching moments from their childhood. The show’s executive producer, Nick Kent, said: “This film will show Princess Diana in a way she has never been seen before, through the eyes of the two people who knew her best.” We're also promised "An unprecedented look at the life and work of Princess Diana" In the trailer, Prince Harry even says that “This is the first time that the two of us have ever spoken about her as a mother." Diana, Our Mother: Her Life and Legacy airs later this month. https://www.youtube.com/watch?v=-9AFcZgGCNw https://twitter.com/HBODocs/status/883656935320338433