Princess Diana's secret love affair with Dr. Hasnat Khan is the subject of Oliver Hirschbiegel's latest film "Diana," a biopic that chronicles the private life of one of the most famous women in history.

A new sneak peak of the film has been released that sheds light on the alleged racy affair Lady Di had with Khan.

The "Diana" trailer opens with Naomi Watts, who played the late royal, opening a package that holds a long, dark brown wig, that Princess Diana actually used to go out with her lover, Yahoo reported. Diana would reportedly cover her identity with the wig, a pair of dark glasses, and an understated black dress. Princess Diana would duck in and out of the shadows, hiding in the corners of jazz clubs with Khan.

The film, which has already been released in the UK, also features some portions that show Diana's humanitarian work, from charity events to travelling to foreign countries.

But the focal point of the film zeroes in on how Princess Diana's private life shifted upon meeting Khan, a Pakistani surgeon practicing medicine at a hospital in London.

Friends of Princess Diana said that the late royal would run to Khan's apartment to do dishes and fold his laundry, Yahoo reported. Khan wasn't interested in pursuing anything serious with Diana, however, and at the time of their involvement, he was engaged two times, though he ended relations before the ceremony. He also didn't have a desire to live life in the public eye, and wanted to sidestep the enormous scandal of dating a woman married to Prince Charles.

After the movie's premiere in London, the British media responded with disbelief at the negative portrayal of Diana's lifestyle.

The Mirror called the movie a "cheap and cheerless" effort, while the Sunday Times called the script "embarrassing."

"Even when these lines are delivered by the fragrant Naomi Watts, doing her level best with a squirmingly embarrassing script, this film is still atrocious and intrusive," a reviewer at the Sunday Times wrote.

The film opens in U.S. theaters on November 1.