“I was Larry Birkhead‘s secret gay lover!”

That’s the sensational revelation of Kerrick Ross — a handsome male model who carried on a torrid two-month sexual affair with the man who won the blockbuster paternity battle for Anna Nicole Smith‘s baby girl.

In a bombshell world exclusive, The new issue of the NATIONAL ENQUIRER publishes the stunning truth about the secret gay life of the world’s most famous out-of-wedlock father.

“America doesn’t know the whole story about Larry Birkhead,” Kerrick, who’s 38 and lives in Louisville, Ky., told The ENQUIRER.

“He apparently had sex with Anna Nicole and fathered her baby, but there is no question: He also had sex with me!”

The two met at a cocktail party in Louisville around mid-2000 when Birkhead was a struggling real estate agent and writer, angling for a show business career in Hollywood.

“We were together for about two months and had sex eight to 10 times, always at my apartment. He often spent the whole night with me.”

But Birkhead insisted on keeping their romance a secret. “I had been ‘out’ for a long time, but Larry was not out of the closet — and he was terrified about his family, who were devout Southern Baptists, finding out he was having a gay relationship,” revealed Kerrick.

“He was especially afraid of his father finding out. He said, ‘If my Dad knew about this, he would kill me!’

Birkhead’s lawyers deny that he had a gay relationship with Kerrick, but Kerrick passed a rigorous polygraph test administered by a top-notch examiner.

And Kerrick says Larry didn’t consider himself gay. “He was more comfortable saying he was bi-sexual,” Kerrick told The ENQUIRER. “I never knew him to go out with women when we were together, but I found out after we broke up that he had been seeing women. “While Kerrick says Birkhead was inexperienced at gay sex, he found out later that he’d stolen Larry from another man!

The new issue of the NATIONAL ENQUIRER has more details about Larry’s other relationship plus an independent eyewitness account of Kerrick’s relationship with Larry.