Macaulay Culkin proudly calls himself a "Doo Doo Head." When cops raided Michael Jackson's Neverland Ranch almost three years ago, they bagged a picture of Culkin from Jacko's bedroom. The framed "Home Alone"-era shot stood out like a sore thumb when video of the raid was shown during Jackson's kiddie-sex trial last year. That video, however, didn't focus closely enough to see Culkin's autograph. A Santa Barbara County judge recently unsealed almost 900 pages of previously secret court documents, including a description of that creepy photo. The Post's David K. Li reports that a sheriff's evidence-inventory memo states: "The photograph was signed and had a message written on it. The message stated, 'To Apple Head. Always remember keep Apple Head Club Doo Doo Head Alive.' It was signed 'McCauley Caulkin' [sic] and, in parenthesis, 'Doo Doo Head.' " In Neverland speak, Jackson and his special young male pals were "Doo Doo Heads" and their secret society "the Apple Club." Culkin played a star role in Jackson's defense last year, testifying that the pop star never molested him despite testimony of former Neverland workers who said otherwise.