A friend of the late Princess Diana is speaking out this week to say that her younger son Prince Harry “unquestionably” resembles her.

Stewart Pearce spent years working as Diana’s voice coach before she tragically died in 1997. He told US Weekly that of her two sons, Harry “unquestionably” reminds him more of Diana.

Pearce, who wrote the book Diana: The Voice of Change, said that Harry’s older brother Prince William looks like Diana with “his pure features,” especially his light blue eyes, which are similar to the “sapphire blue” hue of his mother’s.

“But Harry, in terms of his impetuosity [is Diana]. Harry, in terms of his intuitive explosions of energy, [is the most like her],” Pearce continued. “I suppose, slightly, William from the external point of view. But Harry from [his] wonderful ebullience [and] passionate [personality embodies his mother]. He’s the guy. He loves life. He has fun.”

He went on to say that like Harry, Diana was on a quest to find a “quality of balance in her life.” That’s how she ended up working with Pearce, who helped her use her voice for good.

“What was extraordinary from the very beginning, from 1981, is that she was really not given a tremendous amount of advice. It’s sort of within the royal family, it’s assumed you will either grow through it, or, you know, [you’ll sink],” Pearce explained, pointing out that the “same thing” happened with Harry’s wife, Meghan Markle, after she married into the British royal family.

“She was given very little advice, but being the smart woman that Meghan is, she really made a lot of inquiries,” he said of Meghan. “Whereas Diana, I feel that she was so in love with [Prince] Charles that she thought that he would assist her.”

Pearce claimed that Harry and Meghan became “forces of change” when they spoke out against the royal family, noting that Diana was “one of the first great voices of change” during her lifetime.

Back in March, Harry penned an emotional letter to bereaved children in which he said that Diana’s death “left a huge hole” inside him.

“When a parent goes to heaven, I was told their spirit, their love and the memories of them do not,” Harry wrote. “They are always with you and you can hold onto them forever. I find this to be true.”