Previously unseen court documents have revealed child star Macaulay Culkin was affectionately known as 'Doo Doo Head' by close pal Michael Jackson as part of a secret Neverland society. The papers, recently unsealed by California judges following the singer's child molestation trial last year (05), contain a photograph of Culkin obtained from Jackson's bedroom. Gossip site PageSix.com reports that an accompanying police memo says, "The photograph had a message written on it. The message stated, 'To Apple Head. Always remember keep Apple Head Club Doo Doo Head Alive.'" The photograph was signed by Culkin who added 'Doo Doo Head' after his name. It is believed the Apple Head Club was a secret society Jackson encouraged his young friends to join. Home Alone star Culkin testified in Jackson's defence last year (05), insisting the THRILLER singer had never molested him despite testimony of former Neverland workers to the contrary.