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Though Michael Jackson was wed to Prince and Paris' mother, Debbie Rowe, their biological father is Arnold Klein, Jackson's L.A.-based dermatologist and Rowe's former boss, multiple sources confirm to the new issue of Us Weekly.

"He is the dad," says a Jackson insider. "He and Debbie signed an agreement saying they would never reveal the truth."

Though neither Rowe nor Jackson ever spoke publicly about their kids' true lineage, she did admit in 2002 that she carried his children as a personal favor (and would not confirm that the marriage was ever consummated).

"I said, 'Let me do this. You need to be a dad. You have been so good to me,'" Rowe -- who met Jackson when she was a nurse's assistant in the 1980s -- has said.

Klein would not give a comment to Us.

For more details on Michael Jackson's shocking home life with his three children, how the kids are coping with his surprise death and never-before-seen private family photos, pick up the newest issue of Us Weekly, on stands tomorrow.

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