'Diana' Trailer: Watch Now!

Naomi Watts stars as beloved Princess in film due November 1.

She may have been The People's Princess, but there was much Diana, Princess of Wales, kept from the public's prying eye — intimate details catalogued in author Kate Snell's 2000 account "Diana: Her Last Love," the inspiration for the upcoming film starring Naomi Watts.

The film spans the final two years of Diana's life, before she — along with companion Dodi Fayed and driver Henri Paul — was killed in a car accident in Paris in 1997. At the center of "Diana" is the secret affair the Princess carried on with surgeon Hasnat Khan (played by "Lost" actor Naveen Andrews).

A new trailer for the biopic captures this clandestine romance, juxtaposed against the demands of Diana's high-profile persona. The clip opens with the Princess engaged in her royal and philanthropic duties — walking red carpets and crusading against land mines. But soon we see her meet Dr. Khan, telling him in no uncertain terms: "Charles and I live separate lives." Thus begins the under-the-table hand-holding, wig-wearing and secret rendezvousing, which, in a story familiar to us all, culminates in salacious tabloid headlines the world over.

And while her last beau, Fayed, is introduced in the clip's closing moments — and, as it's hinted at, used to make Khan jealous — it's clear Diana's love affair with the good doctor is the beating heart of this film.

"Diana," directed by Oliver Hirschbiegel and adapted by screenwriter Stephen Jeffreys, bows November 1.