Michael Jackson's child accuser was reportedly seen pleasuring himself while watching porn at the star's ranch, Jackson's cousin has revealed.

According to The Sun, Jacko's 12 year old cousin Rio, said he saw the "nasty stuff" when he shared a room with the boy and his younger brother at Neverland.

"I saw them turn to a channel that had naked girls and they were doing nasty stuff," he said.

He went to Jackson's room to tell him, but the star did not believe him.