Singer Michael Jackson may end up losing two of his children in a custody battle with his ex-wife as she claims that he is not their father.

Secret papers, which will be revealed in court next month, will apparently reveal that the father of Paris, 8, and Prince Michael, 9, were fathered by an anonymous sperm donor.

Debbie Rowe, the mother of the two children, gave up rights to the pair in exchange for a multi-million dollar pay-off. However, she is now asking for access to them, claiming that Jackson had "abducted" the children, taking them to Bahrain on "faked passports".

Jackson is said to be horrified by the prospect of a legal battle with his former wife and is terrified he will lose his children.