New Princess Di tell-all out Tuesday

It was billed as the big publishing event of the fall – “a shattering, provocative and mesmerizing true story” so momentous that booksellers ordered copies without even knowing what they would receive.

Now, the secret is out: The mystery work is Paul Burrell’s “The Way We Were,” the latest tell-all about Princess Diana by her former butler, who also wrote the 2003 best-seller “A Royal Duty.”

“The Way We Were,” which takes the reader into the lively day-to-day life at Kensington Palace with “previously unseen photographs of the interiors,” goes on sale Tuesday.