Charlie Sheen will reveal to the world that he's HIV positive.
Sources connected to NBC's "Today" tell TMZ ... Sheen will sit down with Matt Lauer on Tuesday morning to make the announcement.
NBC touted the interview in a press release as Sheen making a "revealing personal announcement."
A tabloid report came out Monday claiming Sheen's been keeping the diagnosis secret for years. You've gotta imagine he'll address that report tomorrow morning on "Today."