The 50-year-old was on hand to support the cause with the proceeds from the party benefiting the Elton John AIDS Foundation. Though he had been invited for years, it was his first time attending. "If I don't show up, then who the hell would?"

Sheen attended wearing a shirt with his face emblazoned on it along with the words, "Stay positively negative," a message urging people to avoid HIV. He admitted that he felt weird sporting a tee of himself. "The T-shirt is for sale on Represent.com, and a lot of the proceeds go to the pediatrics AIDS fund and Elton's foundation." He joked, "I'm contributing with T-shirts - it's come down to that."

In all seriousness, Sheen is humbled by all the good wishes he has received since going public with his diagnosis. "They talked about the Charlie Sheen effect; it felt heroic, it felt progressive, it felt like there's a real dialogue now."