Old man and the seed?

Anna Nicole Smith's death became even more bizarre than her life yesterday as a series of bombshell revelations uncovered an ever-growing web of sexual intrigue - including the startling claim that her late billionaire husband may be the father of her infant daughter.

The stunning disclosure comes in a no-holds-barred manuscript written by her half-sister Donna Hogan obtained exclusively by the Daily News.

Hogan alleges that her sister froze the sperm of 90-year-old J. Howard Marshall years ago, and believes she may have used it to become pregnant.

The revelation topped even the unseemly paternity suit that raged in a Los Angeles court less than 24 hours after Smith's death.

The former Playmate's live-in companion and her former boyfriend Larry Birkhead both claim they are the father of baby Dannielynn - the little girl who could inherit up to half of Marshall's $1.6 billion fortune.

They weren't the only ones laying claim to Dannielynn yesterday.

Smith's mother, Vergie Arthur, flew to the Bahamas yesterday to see her grandchild for the first time. The infant had been left with friends in the Bahamas.

And amid all the legal maneuvering, Zsa Zsa Gabor's wacky husband, Prince Frederic von Anhalt, made the bizarre claim that he fathered Smith's daughter. A publicist for Gabor, 90, said von Anhalt was full of it.

But even the battle to be named the father of Dannielynn was overshadowed by the claims in Donna Hogan's unpublished manuscript.

In the aptly named "Train Wreck" - written with author Stacy Brown - Hogan says: "I wouldn't be shocked at all if it's J. Howard's. She saved his sperm after all and that maybe [sic] her trump card in her fight to get the old man's estate."

Depicting her half-sister as ever calculating, Hogan wrote that Smith was "seeing into the future. ... She takes Howard in to have his sperm tested. When the results show that he is still fertile, she has a quantity of his sperm frozen."

Hogan wrote that when her half-sister announced to the world she was pregnant, she declined to name the father.

"To her family, she hinted that she had used the old man's frozen sperm, and would be giving birth to Howard Marshall's child," the manuscript claims.

Later in the book while discussing the paternity fight, Hogan unleashed one of her many scathing descriptions of her half-sister.

"That's my sister for you. That b---h probably doesn't even know who the father is. Soon she'll probably say it's J. Howard's," Hogan wrote.

Hogan could not be reached for comment yesterday, but in an interview with "Inside Edition" she said, "I don't want people to talk about the crazy stuff. ... I want them to remember her for being full of life."

Nevertheless, Hogan describes a campaign by Smith to marry the aging oil baron and then the cold hearted way she treated her "Paw Paw" after the ring was on her finger.

Hogan, who uses Smith's given name Vickie in the manuscript, wrote that her sister met "Old Man Howard" at a Houston strip club called Gigi's, where Smith worked as a stripper and the wheelchair-bound geriatric was a regular.

"For several weeks, she played hard to get, before agreeing to grant him special favors outside the club," she wrote.

Smith married Marshall in 1994 when she was 26 and he was 89 - over the objections of the oil man's son, E. Pierce Marshall.

After the wedding, however, she treated her husband like a dog.

"She refused to allow him to lie next to her, stating that he would urinate in bed," Hogan he wrote.

Smith tore through Marshall's finances accumulating jewelry, houses, luxury cars while cheating on him "with household servants, girlfriends and married men."

She would leave him for weeks at a time, refuse to return his many phone calls, and when she did spend time with him, Smith was often oblivious to his frailties.

Once, Smith dragged Marshall out to dinner even though he was ill and "left J. Howard in his wheelchair in the rain."

But when Marshall finally had enough, Smith scampered back "to ensure her place as heiress to his fortune."

"Do you miss your rosebuds?" Smith said at one encounter with breasts bared and a tape recorder running, Hogan wrote.

"Train Wreck" states that Marshall "clearly loved Vickie," and that he called her almost daily, calls she generally ignored. She didn't even visit the old man for the last month of his life.

At the end, Marshall had had enough.

"On the night before he died, J. Howard refused Vickie's phone call. He died tired of Vickie," Hogan wrote.

Marshall's death in 1995 set off a court battle for his $1.6 billion estate that continues to this day.

The bitter legal war with Marshall's son lasted a decade, but it immediately became a fierce fight over every little detail of Marshall's life - even his remains.

The son and widow went to court over who got possession of Marshall's ashes and they decided to split the ashes - what Hogan calls a "half-ash settlement."