Larry Birkhead Fires Back at Woman Claiming He Had Sex With Howard K. Stern

Larry Birkhead, the father of Anna Nicole Smith's daughter, is firing back at the woman who's claiming that he and longtime Smith companion Howard K. Stern were lovers.

According to a new book, “Blond Ambition: The Untold Story Behind Anna Nicole Smith’s Death” by journalist Rita Cosby, Smith and a friend allegedly caught Stern and Birkhead engaged in oral sex, the New York Daily News reported Sunday.

"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."

But in Tuesday's Daily News, Birkhead says that former pro volleyballer Hatten "isn't a credible source," and adds that she "tried to come to the Bahamas to see Anna last year and Anna wouldn't let her ... This book is coming from the losers' club because they all have axes to grind."

Hatten's brother is Mark Hatten, who's in a California prison for stalking Smith and once claimed to be the father of Smith's daughter, Dannielynn.

Jackie Hatten once said that she thought that Birkhead and Smith were "madly in love" after their first date.

"They were trying to have babies the first day they met in my bed, OK?" she told Larry King back in February.

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 Sunday. “I’m gonna sue Rita Cosby for it.”