The royal released a video of him discussing his secret: fear of public speaking.
"My secret is, believe it or not, I get incredibly nervous before public speaking no matter how big the crowd or the audience," Prince Harry said. "And despite the fact that I laugh and joke all the time, I get incredibly nervous, if not anxious, actually before going into rooms full of people when I'm wearing a suit."
The prince continued, joking he would get more attention after his confession and thanking viewers who participated in the campaign.
"Now that I've confessed that, I'll probably even more worried that people are looking at me," he said. "But, thank you very much for everyone who's taken part, and I must encourage as many people to get involved as possible."
Prince Harry also released another video in which he spoke about his non-profit organization Sentebale and urged people to help in their cause, according to CBS.
"To show our support for the children of Lesotho, and help reduce the stigma for all those affected by HIV, we are turning World AIDS Day into a day in which no one should feel any shame about their secrets," he said.
"One tragic issue, in particular, is the shame and stigma linked to HIV," he explained. "This causes thousands of children to needlessly die each year because they're keeping their illness a secret, and not getting the medical attention they need."
Celebrities have joined the campaign, including former Pussycat Doll Nicole Scherzinger, "Hansel and Gretel: Witch Hunters" star Gemma Arterton and singers Joss Stone and Paloma Faith. They all posted their secrets on social media, according to Mashable.
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