US pop star Michael Jackson is under attack once more, with the former nanny of his children, Grace Rwaramba, accusing the "Beat It" singer of disowning her once she was diagnosed with Lupus.

Last month rumours were also rife that the singer had married Rwaramba, although those reports proved false.

According to a "source" in the New York Post, Rwaramba is not coping well at the moment.

"She's ill and she could use his spiritual, mental and financial support right now. I do believe [Jackson] has affection for Grace, but he acts like a child. He could at least give her a call and say, 'How are you doing, Grace? Do you need more doctors?'. But it's never like that. It's always taking."

Jackson's spokesperson, Raymone Bain, insists it's all untrue.

"It's a hilarious rumour. I can guarantee she is not very ill. I've spoken to her in the last two hours."