Shocking claims of FARRAH FAWCETT’s  “secret lover” behind RYAN O’NEAL’s back revealed in multi-million dollar lawsuit.

A multi-million dollar lawsuit between Ryan O’Neal and the University of Texas over a missing Andy Warhol portrait has plunged Farrah Fawcett’s legacy into chaos — a tawdry tell-all about a “secret” 11-year affair she allegedly had behind the back of her long-time lover, RadarOnline reported.

Farrah’s high school sweetheart, Greg Lott, was questioned during a deposition regarding the painting on October 24 last year.  But in the course of the interrogation, he revealed much more — including the actress’ sex life, their secret love letters, international jaunts together behind-the-back of O’Neal and her often volatile relationship with the Oscar-nominated Love Story star.

Most shockingly of all, Lott, a former University of Texas footballer who met Farrah in 1965, told lawyers that Farrah was his “girlfriend” until she died, according to a 273-page transcript of the deposition in Lubbock, Tex.

The pair was in a “committed relationship… exclusive,” he said, until her untimely death of cancer on June 25, 2009, at age 62.

“For the record … this was a romantic relationship?” a lawyer probed Lott during the deposition. “Yes,” responded Lott.

“A sexual relationship,” questioned the attorney. “Yes,” responded Lott. “She saw no one else and I saw no one else but her.”

Lott’s stunning revelation has been an unforeseen side effect of O’Neal’s battle with the University of Texas over the ownership of an Andy Warhol painting of Farrah that was bequeathed to the school upon her death.

A twice-convicted felon, Lott described under oath and penalty of perjury how he was drawn to the tall blonde on campus at the University of Texas in 1965. They dated for two years, he said, until she left for the bright lights of Hollywood.

But Lott told lawyers that they reconnected decades later.

As proof of his claim, he provided six years of phone records and a stack of handwritten love notes which he purports to be from Fawcett.

“I think those letters speak for themselves,” Lott declared to lawyers.

When asked during the deposition what Fawcett meant by “happy new life”, Lott said: “Our happy new life together again.”

“Is it your testimony that Ryan O’Neal was not in a relationship with Ms. Fawcett between 1997 and 2009?” one legal eagle quizzed.

“Yes, except for (their contact regarding) a dysfunctional son… He’s a drug addict,” said Lott, referring to Farrah and Ryan’s son, Redmond, who has since become sober.

Lott even claimed to recall a 1998 conversation with Fawcett when she asked if he wanted to date “exclusively.” “I said, ‘No, I don’t want to see anyone else,’” Lott claims. “She said, ‘I don’t want to see anyone else.’”

Lawyers asked if he ever discussed the notion of monogamy with her after that time, especially in light of her public appearances with O’Neal.

Lott insisted: “Didn’t have to.”

But questions about Lott’s credibility have long lingered.

O’Neal has dismissed him as “a disgruntled ex-boyfriend from the Sixties,” a claim hammered home by lawyers representing the Hollywood actor during the course of the deposition.

 “How do you explain that nearly every tabloid in America reported that Fawcett and O’Neal were a couple during the period ’01 to ’09,” Lott was asked.

“Because they had photos of them when she would pick up her son at the gym or drop him off at the gym or, you know, what have you,” Lott said. “My understanding is he (O'Neal) claims that he was with her for 30 years. That discounts my 11-year relationship with her.”

Asked if he thought O’Neal was a liar, Lott said. “In that regard, yes.”

Sadly, Farrah was diagnosed with anal cancer in 2006 and passed away on June 25, 2009. Lott said he came forward because he wanted the “truth to be told…. That I was her lover and boyfriend.”

He insisted during the depo, “It wasn’t any secret. Everybody in Texas knows it.”

But despite Lott’s version of events, questions linger and O’Neals lawyers are set to press him on his criminal past. He was convicted and jailed in 1972 for conspiracy to transport marijuana and again, in 1982, for conspiracy to sell cocaine.

The lawsuit to obtain the Warhol painting is slated to resume next month with both Lott and O’Neal docketed to testify.