New York, Sept 3 : A new book on the late Anna Nicole Smith has revealed that the model's long time partner Howard K Stern and her daughter's biological father Larry Birkhead were gay lovers.

The book 'Blonde Ambition: The Untold Story Behind Anna Nicole Smith's Death' written by former MSNBC journalist Rita Cosby alleges that Smith and her friend caught Stern and Birkhead red-handed.

Jackie Hatten, Smith's close friend, said that she and Smith caught the two while they were having oral sex.

"Their bodies were intermingled. It was obvious what was happening," the New York Daily News quoted an excerpt from the book.

In the book, Cosby describes Stern as a jealous, money-grabbing control freak who worked out ways to manipulate the blonde star for his gains.

According to the author, Stern and Birkhead worked out a secret deal, with the latter winning the custody of Dannielynn and Stern being named the executor of the Playboy model's estate.

During Smith's final days, she was put up in hotel while she had high fever and was under the supervision of Stern.

Cosby claims that Smith picked up an infection from an injection jabbed into her left butt and being right-handed, Smith could have never injected the needle herself.

Stern's lawyer, Lin Wood, called the book's claims "false and defamatory."

Wood added that 'Cosby has taken the coverage to a disgusting new low for which she will be held legally accountable'.

"It appears that Ms. Cosby has joined the ranks of tabloid journalists who are willing to publish the print equivalent of sewerage to engage in character assassination for profit," Wood added.

Birkhead has also vehemently denied the claims and said that he is going to sue Cosby.

"None of it is true,. I'm gonna sue Rita Cosby for it,' Birkhead said.

"If she printed that then she is really getting sued, My attorneys are going after her and that is absolutely false. And I am sure Howard and the estate and everyone else involved is going to sue her too. This is just nonsense," he added. (With Inputs from ANI)