Princes William and Harry’s touching final tribute to Princess Diana will tug at your heartstrings

FILE -- In this Sept. 6, 1997 file photo, Britain's Prince Charles, Prince Harry, Earl Charles Spencer, Prince William and Prince Philip, from left, stand as the coffin bearing the body of Princess Diana is taken into Westminster Abbey, in London. Princess Diana would have been 50 years old on Friday, July 1, 2011, perhaps the only certainty about the course of a life abruptly cut short in a 1997 car crash in Paris, with a new boyfriend, two months past her 36th birthday. (AP Photo/John Gaps III, pool,file)

A new ITV documentary to commemorate the 20th anniversary of Princess Diana’s death revealed the touching final tribute her two sons, Prince William and Prince Harry, chose for her funeral.

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The 15-year-old and 12-year-old princes were charged with the task of picking out flowers for the ceremony, and they chose a beautiful arrangement of white roses — their mother’s favorite. The gorgeous display sat atop her coffin along with an enveloped card that read, “Mummy” as it traveled through London to Westminster Abbey.

Flowers and a card reading “Mummy” is seen on top of Princess Diana’s casket on its way to the funeral at Westminster Abbey in London, Saturday, Sept. 6, 1997. (AP Photo/Jerome Delay, Pool)

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The documentary, “Diana: The Day Britain Cried,” will air later this month and is narrated by actress Kate Winslet. It features interviews with people who were close to the princess and those who ended up arranging her funeral, including one with royal florist Lisa Webb who helped the boys organize their tribute.

“The flowers were chosen by the princes,” she explained.

From the left Prince William, Earl Spencer, Prince Harry and Prince Charles approach gun carriage with the coffin of Diana, Princess of Wales in London Saturday, Sep 6, 1997, during the funeral ceremony. (AP Photo/Dusan Vranic, POOL)

In another documentary set to air on BBC this month, Prince William spoke candidly about his mother’s funeral, including what it was like for him and brother Harry to march behind her coffin.

“It was one of the hardest things I’ve ever done, that walk. It felt she was almost walking along beside us to get us through it,” the Duke of Cambridge said.

RELATED: Princes William and Harry speak candidly about Diana’s funeral in an emotional BBC documentary

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