Dr. Arnie Klein Admits He Was a Sperm Donor ... to Someone, at Some Point

The lingering debate over who is the biological father of Michael Jackson's kids did not exactly get answered yesterday by Dr. Arnold "Arnie" Klein.

On Good Morning America, he offered the cryptic non-answer that he is not the father ... to the best of his knowledge. That was a head-scratcher.

Last night, Arnold Klein took a similar route on Larry King Live, though he did elaborate a little bit, admitting that he donated sperm at one point - to a sperm bank, and not to Michael Jackson directly, he maintains adamantly.

As far as he knows, he is not the father of Jackson's children. End of story. The dermatologist said he's willing to submit to a DNA test to establish paternity.

Us Weekly has stated as fact that Klein is the biological father of Prince and Paris Jackson. No other celebrity news publication has confirmed this.

Meanwhile, Dr. Arnold Klein thinks Jackson and ex-wife Debbie Rowe (Klein's former assistant) did consummate their marriage. TMI there, Arnie.

As for the King of Pop's drug use, Klein insists he is not one of the five doctors currently under investigation for supplying Michael Jackson with dangerous prescription drugs that many believe led to his demise in some form.

But Dr. Arnie Klein, Michael Jackson's longtime friend, does now admit to giving him Demerol - one of the strong painkillers Jackson sought out.

Klein says it was only "on occasion" to sedate the pop legend.

Asked about Diprivan, the brand name for Propofol, the hospital-only anesthesia found in Jackson's house when he died, Klein said he was aware Michael was using it, but did not prescribe it, and wouldn't even know how to use it.

He also says he warned Michael Jackson of its dangers.

Here's Arnie Klein on Larry King Live ...