WASHINGTON — Nobody sold newspapers like Princess Diana, and now Tina Brown is hoping that juicy memories of the People's Princess will do the same for her first book.

The former magazine maven, credited with taking gossip upscale as editor of Vanity Fair in the 1980s, released "The Diana Chronicles" just before what would have been Diana's 46th birthday on July 1 and the 10th anniversary of her death in August. The book offers no real scoop after so many previous accounts of the princess' life, but Brown says the "Chronicles" is crammed with fresh detail.

"I'm very well-sourced in the book in the sense that I did 225 new interviews, and many of those were really insiders in the royal circle," Brown said over tea on a recent afternoon at The Ritz-Carlton Georgetown.

Diana was a natural subject for Brown's first book because coverage of the princess helped define Brown's journalistic career, and she knew many people in Diana's world.

"When you think of the great, iconic stories that people seem to have kind of bottomless interest in, you think about Marilyn (Monroe) and John F. Kennedy and Diana," Brown said. "I think Diana has left an enormous footprint."

TIMING OF BOOK WAS RIGHT

The book has jumped onto best-seller lists. The book is already in its fifth printing — up to 245,000 copies.

Now 54, Brown still wears a haircut similar to Diana's — short and blond — and an understated black dress.

Her Doubleday editor says the time was right for the Diana book. "It was her 10th anniversary, and Tina was ready to write the book," said editor Phyllis Grann. "It was the ideal match of subject and author."

Brown had been working on the book since she started covering Diana as the 25-year-old editor of London's Tatler magazine. As Diana's star rose, so did Brown's. From Tatler to Vanity Fair to The New Yorker, Brown explained the royals to America — and sold magazines.

'LOVE TRAIN' MYSTERY EXPOSED

The "Chronicles" details Diana's wounds from her childhood with her parent's divorce and her mother leaving when she was only 6. It dredges up a rumor over Diana's virginity before her engagement to Charles, once thought debunked. But Brown assures that she has confirmed that Diana did indeed visit Charles twice in the middle of the night for what's thought to be a secret love tryst on the royal train. She says it wasn't Camilla Parker Bowles on the "love train," as some had thought.

"I basically found the source of the story in the first place, and I discovered that a policeman who had been at the train sighting had faxed through the number plate of the car that was going to meet Charles," Brown said. The car belonged to Frances Shand Kydd, Diana's mother. "So either we're to assume that Diana's mother was having an affair with Charles, or it was Diana on the royal train."

Both 19-year-old Diana and the palace insisted it wasn't her. "It seems clear now that Diana, for reasons of panicked self-protection, colluded with the Palace machine to protect the anachronistic facade of virginity," Brown wrote. "In a sense, the Love Train incident was the moment she first became a Royal."

Brown was proud to nab an interview with actor John Travolta about his memories of dancing with Princess Diana in 1985 at the Reagan White House.

"As soon as we get out there, the whole place clears for our encounter," Travolta told Brown. "And I look her in the eyes and reassure her with my eyes to say, 'We're OK.' We probably only dance 10 minutes, but it feels like 20."

DIANA CHANGED MONARCHY

Among Diana's strongest legacies, Brown said, was changing the monarchy by giving it a more a modern, compassionate, accessible face. The birthday concert Prince William and Prince Harry threw for their mother on July 1 is a good example.

Brown met Diana for a long lunch in New York in 1997, just before her death. The princess had become a confident and "totally evolved sort of global superstar," Brown said. But that was before a downward spiral leading to her death. The princess suffered from terrible insecurity. Brown said she later realized Diana had been rejected by her last true love, a doctor named Hasnat Khan, and was irritated that Charles had thrown a 50th birthday celebration for Camilla.

"It was a throwback to the worst moments in her life, where she felt so abandoned," Brown said. "So she went off with Dodi (Fayed) in a sense just for the protection. That was the irony." Diana's critical mistake, Brown said, was giving up royal security. If she hadn't, she would never have been driven with Fayed by a drunken chauffeur through that Paris tunnel.