Charlie Sheen is going to have a very special guest in the audience tonight for the opening of his comedy tour ... none other than porn pal Kacey Jordan.
Kacey tells TMZ she'll be in the audience in Detroit tonight for Charlie's "My Violent Torpedo of Truth/Defeat is Not An Option" tour. Kacey says she has 8th row seats and plans on "making it known" that she's there.
Considering what she does for a living, that could mean any number of things.
UPDATE: Guess Kacey caught someone's eye ... she tells us, "Charlie's people just came to me in the middle of the show to meet up with him afterwards and gave me a pass."