Little by little we’re able to fill in the blanks from Michael Jackson’s last few weeks.

Now it turns out that back on May 5th he ran into an old friend and not only told her that he felt great, but showed off, too.

Joanne Horowitz manages Kevin Spacey and other actors. But back in the 1970s she worked in the music business and was the publicist for Studio 54. It was then that she met Michael, around the time of “Off the Wall.” They hit it off, became great pals, and for a while she was his guide in New York.

Flash forward to this past May 5th: Horowitz was in Beverly Hills waiting to see her dermatologist. From one of the adjacent examination rooms she heard a lot of noise, thudding on the ground and hitting the walls.

“I asked the doctor what was going on,” Horowitz told me last night. “He said it was Michael Jackson, practicing dance moves.”’Horowitz’told the doctor, Arnold Klein, Michael was her old friend. Klein went next door and told Jackson, who came running in.

“We were so happy to see each other, It had been 25 years,” said’Horowitz. “He was in great shape, don’t let anyone tell you otherwise. He showed off his body ‘ flexing his muscles, he also lifted his shirt to show me his new six pack. He said he’d been working out for the new tour. He was very proud. He looked very fit. He wasn’t wearing any makeup, either. And he had no bodyguards with him. He was just on his own.”

Horowitz and Jackson reminisced about the old days, and Michael bragged to her about being a father. He invited her to the London shows, and even signed a CD for her that Klein kept in his office.

“He said everything was going great but he’d just gotten off the phone with someone about that auction, and he wasn’t happy about that. But he seemed like the old Michael.”

Horowitz did tell me she’s been very dismayed about the coverage of Jackson since his death, especially the notion presented by tabloids, tmz.com and other outlets that the performer “wanted to die” and other crazy ideas.

“That couldn’t have been further from the truth,” Horowitz tells me.

Now that there’s a brief lull in the Michael Jackson soap opera, let me make this perfectly clear: Debbie Rowe is the mother of Prince and Paris, Michael’s two eldest children. She gave birth to them. It’s very well documented.

Whether Debbie used donor eggs or her own is irrelevant. Millions of mothers around the world who’ve used donor eggs will tell you that. And I’m fairly certain that since the kids look so much like Debbie, they came from her biology.

Furthermore, Dr. Arnold Klein is not the father. These reports from US Weekly and TMZ are so preposterous they would be laughable if only actual children weren’t involved.

Michael Jackson was the children’s father regardless of his biological participation. He raised them, and loved them, and was totally devoted to them. In the 2005 trial, as I reported then, a slip of the tongue by one of the attorneys indicated that he was not their biological father. I was told by good sources that Rowe was inseminated from a sperm bank. In the long run, it doesn’t matter.

As for Blanket, aka Prince Michael II, I also reported back in 2005 that he was the product of Jackson’s sperm and a hired surrogate. That’s why there is no mother’s name on the birth certificate.

TMZ and US Weekly continue to practice malicious and wreckless reporting. Let them back up their accusations with named sources, or keep it to themselves.

Readers of this column have known for days that Michael Jackson wrote a will in 2002. Now I can tell you that he assigned guardianship of his three kids to his mother, Katherine Jackson. He gave his 80-year-old mother the responsibility of raising his two sons and daughter but made no mention of his father.

In fact, Jackson’s will does not mention his father, Joseph, at all. It divides his estate among the children and his mother only, sources say. His brothers and sisters are also not included as major beneficiaries.

The will is to be executed by attorney John Branca, as I first reported several days ago.

The news that Mrs. Jackson was named by Michael means that it was entirely unnecessary for her to go to court yesterday to get a judge to make her temporary legal guardian. Doing that, and jumping the gun, may have been a’costly mistake (see below item).

Jackson’did not name Debbie Rowe, his ex-wife and biological mother of his two eldest children. Nevertheless, Rowe can exercise her parental’rights and possibly overturn the will if she makes that’decision.

For Jackson’s brothers and father, their omission from his estate’the will was drawn in 2002’may come as something of a blow. None of the brothers ever attained the success of Michael as an adult. But as one observer pointed out to me, “The brothers have the opportunity to make money now, touring in Michael’s memory.” Good point.

The will’ should be officially available shortly, but if it stands as I’ve been told, many of Jackson’s friends are left out of it. Waiting to see if there are any bequests would be his long time aide Evvy Tavasci, friends like Miko Brando and Mark Lester, Macaulay Culkin, Elizabeth Taylor, the Dominic Cascio Family of New Jersey, ex and current manager Frank DiLeo, and a handful of loyal employees. Jackson’s trio of handlers from the 80s and 90s’Bob Jones, Bill Bray, and Lee Solters’all pre-deceased him.

Michael Jackson was spending $48,000 a month in prescriptions, according to my sources. The print-outs of the bills are said to’come in’eye-opening stacks.

The prescriptions were written mostly by his dermatologist, Dr. Arnold Klein of Beverly Hills. They were mostly filled at his local drug store, Mickey Fine Pharmacy, also of Beverly Hills.

The list of drugs, which was read to me in part, was staggering. Many of the prescriptions were not made out to Jackson but to aides, nurses, other people who worked for him, and, primarily, to a person called Omar Adams. I’ve learned from another source that “Omar Adams” was a name that Jackson made up for a fictitious alter ego.

None of this should come as a surprise. Back in July 2002, I published a story about Jackson’s monthly spending that rocked his world. Included in legal papers for a lawsuit filed against him by an ex-manager was Jackson’s monthly budget for the fall of 2001. The story can be found here.

At the time, Jackson owed Dr.Klein $25,000 and Mickey Fine Pharmacy $10,000. A few years later, the pharmacy sued Jackson for arrears on his account. They said they’d been making his skin-whitening cream and he wasn’t paying for it.

Sources say that the police have now in their possession many vials of various drugs prescribed by Dr. Klein. That should be good news for Jackson’s recent personal physician,’Dr. Conrad Murray, the doctor who was on the scene when Jackson died.

In a story yesterday I quoted a Jackson insider as saying, by the way, that they thought Dr. Murray was introduced to Jackson by his manager of 2008-2009, Tohme R. Tohme. However, Mr. Tohme’s friends insist that he not only didn’t introduce the two, but that he never even met Dr. Murray or had heard of him. So there.

Other doctors may be involved. Back in 2002, another doctor, a lupus specialist named Dr. Allan Metzger‘was owed $20,000. Jackson suffered from lupus, a chronic inflammatory disease,’although he denied it.

More to come, as they say.