An explosive new tell-all book about the final days of Anna Nicole Smith claims that the two men at the center of the custody battle for her baby daughter and fortune were gay lovers, according to a report in Sunday’s edition of the New York Daily News.

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According to the book, “Blond Ambition: The Untold Story Behind Anna Nicole Smith’s Death” by former MSNBC journalist Rita Cosby, Anna Nicole Smith and a friend allegedly caught her longtime companion Howard K. Stern and the baby’s biological father Larry Birkhead engaged in oral sex, the Daily News reports.

"Their bodies were intermingled," says Jackie Hatten, described as one of Smith’s closest friends, according to a copy of the book obtained by the Daily News. "It was obvious what was happening."

The book further alleges that Birkhead and Stern cut a secret deal following Smith's death that gave Birkhead custody of the child, who stands to inhereit millions from the estate of Smith's late husband, oil tycoon Howard Marshall, while Stern was named executor of Smith's estate, The Daily News reports.

Birkhead and a lawyer for Stern strongly denied the allegations in Cosby’s book and promised to take the author to court.

“None of it is true,” Larry Birkhead told the Daily News. “I’m gonna sue Rita Cosby for it.”