It seems we never get tired of hearing news about America’s closest thing to royalty — the Kennedys. But today there’s scandalous news that could fuel your appetite even more for tidbits of the country’s most iconic family.

The New York Post has an exclusive story today on how a new book claims that Jackie Kennedy had a four-year affair with Bobby Kennedy — John F. Kennedy’s brother — soon after her husband’s assassination, and that "everybody knew about the affair." RFK, who was married and father of 11 kids, was Jackie O.’s "true love," according to the book Bobby and Jackie: A Love Story, written by author C. David Heymann, who spent almost 20 years scouring old FBI and Secret Service files, among other items, for evidence to include in his book. He also quotes people like the late Franklin Roosevelt Jr., who served in JFK’s Cabinet; Arthur Schlesinger; Gore Vidal; Truman Capote; and Morton Downey Jr.

Some of the other scandalous charges: It was Jackie, not RFK’s wife, Ethel, who told doctors to take RFK off life support after he was shot; the pair were seen kissing and touching in Palm Beach during Christmas 1964; a Commerce Department official saw Bobby and Jackie on the couch together, with her straddling him, in July 1966.

Meanwhile, historians and experts are weary of Heymann’s tome, saying that portions of the book are attributed to only a single source and claims are unreliable. One of the book’s disbelievers include Pierre Salinger — Kennedy’s White House Press Secretary — who says the tales are total "bull."

Click here to read more about this explosive story. Do you think it’s true?!