"Diana," a biopic of the late Princess of Wales starring Naomi Watts, had its world premiere last night in London's Leicester Square. The movie, which premieres in the U.S. on Nov. 1, revolves around the last two years of Diana's life and her relationship with Pakistani surgeon Hasnat Khan, played by Naveen Andrews ("Lost"). 

Early reviews of the film are in and they are far from positive. In fact, the film so far has been panned by British film critics. Both The Guardian and Mirror gave the film one star out of five. 

"I hesitate to use the term 'car crash cinema,'" Peter Bradshaw of The Guardian writes. "But the awful truth is that, 16 years after that terrible day in 1997, she has died another awful death. This is due to an excruciatingly well-intentioned, reverential and sentimental biopic about her troubled final years, laced with bizarre cardboard dialogue - a tabloid fantasy of how famous and important people speak in private....(Naomi Watts) looks like she's in a two-hour Spitting Image sketch scripted by Jeffrey Archer." 

David Edwards of Mirror calls the film a "cheap and cheerless effort" and complains that Watts looks nothing like Diana.

"Despite a peroxide hair-job, she looks, sounds and acts nothing like the Princess of Wales," Edwards writes. "Wesley Snipes in a blonde wig would be more convincing. As for William and Harry, they only make a small appearance boarding an RAF helicopter. Film fans probably wished there was room for them to make a swift exit too."

In another one-star review, The Times' Kate Muir calls the film "atrocious and intrusive" and writes that Watts does her best with a "squirmingly embarrassing" script.

Watts, an accomplished British-Australian actress who has received Best Actress Oscar nominations for her roles in 2003's "21 Grams" and 2012's "The Impossible, has been defending the film.

"Hopefully if they get to see the film, they will feel that we have done it in a respectful and sensitive way," Watts told BBC TV, when asked if the film would offend Diana's sons. "We try to honour the depiction of her character in the best possible way."

According to The Daily Beast, Watts stormed out of a BBC Radio interview on Wednesday when she was apparently offended by one of the questions. Presenter Simon Mayo later tweeted that Watts had "seemed a tad uncomfortable with the questions."

Check out the trailer for "Diana" below.