Prince Harry Jokes About 1 of the Last Photos He Took With Princess Diana

Prince Harry has recalled the story behind one of the last pictures he ever took with his mother, Princess Diana, in a new documentary premiering Monday.

In a series of photos from Diana’s personal collection recently released to the public for the first time by the royal brothers, the 32-year-old can be seen wrapped in his mother’s arms.

The mother-son duo appear to be on vacation, with Harry wearing a bathing suit and Diana sporting round-frame tortoise-shell sunglasses.

“This one here, I thought you’d like to see — quite a special picture — the two of you which I thought was quite sweet,” William said to Harry, showing him the photo, in the ITV documentary, Diana, Our Mother: Her Life and Legacy, with both of them descending into laughter.

In response, Harry joked, “I just remember having the skinniest legs, and still do.”

The image is just one of many featured in the 90-minute film, as the siblings flip through a family album assembled by the late Princess.

Others show the Princes as children sitting on a bench together, posing for the camera, as well as one of William being held by Diana as she’s pregnant with Harry.

The boys were 15 and 12 when Princess Diana was killed in a car crash in Paris in 1997, and in the documentary they reveal that they spoke to her just hours before her untimely death.

Diana had phoned them that night, but the princes were playing with their cousins at the time so they didn’t speak for long. It’s a decision that’s played on Harry’s mind ever since. “I do remember regretting … for the rest of my life how short the phone call was,” he said. “And if I’d known that was the last time I’d speak to my mother, the things I would have said to her…”

He added, “Looking back on it now it is incredibly hard. Not knowing that was the last time I was going to speak to my mum, and how differently that conversation would have panned out if I’d had even the slightest inkling that her life was going to be taken that night.”

His brother William also remembers the phone call vividly. They were due to meet their mother after spending nearly a month apart, so he didn’t linger on the phone long.

“I think Harry and I were in a desperate rush to say ‘goodbye,’ ‘see you later,’ and ‘we’re going to go off’… If I’d known what would happen I wouldn’t have been so blasé about it. But that phone call sticks in my mind quite heavily,” Prince William said.

Until filming the documentary, the brothers hadn’t really talked about the trauma of losing their mother. “This is the first time the two of us have ever spoken about her as a mother. [It was] arguably probably a little bit too raw until this point. It’s still raw.”

Read more from Yahoo Style + Beauty:

• How One Bride Upcycled 8 Relatives’ Wedding Gowns for Her Own Wedding

• This Gorgeous Dress Is Entirely Made of Books About Strong Women

• Christian YouTube Star Exchanges Vows With His Bride — and Her 4-Year-Old Daughter

Follow us on Instagram, Facebook, and Pinterest for nonstop inspiration delivered fresh to your feed, every day. For Twitter updates, follow @YahooStyle and @YahooBeauty.