Sir Elton John gushed about his friendship with Prince Harry as he chatted to Vanity Fair at the Elton John AIDS Foundation gala on Monday.

John, 71, joined Harry, 34, at the International AIDS Conference in Amsterdam back in July, and insisted “we help each other” out as he was quizzed on the pair’s work during his latest event.

The musician shared, “We help each other; we help his charity, and he helps ours.”

“It’s good. Within the field of AIDS now, anybody who’s working in the field of AIDS—treatment and trying to raise funds—we all work together. There’s not many of us left, so we have to work together—and the more we work together, the quicker it gets done.”

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Harry has followed in his mother Princess Diana’s footsteps in terms of the work he’s been doing with AIDS organizations. He founded the charity Sentebale with Prince Seeiso of the Basotho Royal Family in 2006.

Monday’s gala also saw John receive a standing ovation for his heartfelt speech.

Insisting his charity goes by the motto “no one gets left behind,” John told the crowd: “Unless you show people at the lower end of society that they matter, that they count, that they’re important… When you show love and compassion to people like that, you will get a response.”

“But if you do not, those people will be left behind—they will get angrier and angrier, and we as a human race will look at ourselves and say, ‘We are despicable.’”