It's probably not unfair to suggest there hasn't been fevered anticipation to Oliver Hirschbiegel's new movie Diana, starring Naomi Watts as the late Princess. Sure, we were all vaguely intrigued when the first stills rolled out online, and the trailer was worth a watch, but this wasn't Helen Mirren as The Queen.

Naomi WattsNaomi Watts as Princess Diana in 'Diana'

Suggestions that the film may not be in the best taste - or worse still, may not be any good - were lent credence this week when Watts walked out of an interview with the film critic Mark Kermode and broadcaster Simon Mayo for BBC5 Live.

It is perhaps a little unfair to assume Watts will miss out on the major awards this year - the first reviews of the movie are yet to surface and nobody really knows what to expect. The Australian actress is currently offered at 10/1 to win Best Actress at the Oscars and listening to most commentators would suggest Cate Blanchett already has one hand on the statuette for Woody Allen's Blue Jasmine.

However, when the actress was in to speak with the formidable Kermode about her portrayal of Princess Diana, she appeared to buckle under the questioning. 

Mayo tweeted: "A first for me and @wittertainment as Naomi Watts walked out of an interview! She seemed a tad uncomfortable with the questions. Shame."

Though the DJ hinted that it was the line of questioning that caused Watts to walk, Kermode made it clear that his probing did not focus on the taste of the movie, "No, not at all. Didn't express any opinion. So still baffled," he replied.

Mayo - who's partner recently took over from Phillip French at the Observer - joked to fellow BBC presenter Shelagh Fogarty: "The honest answer is I have no idea. You know my hectoring style is always a problem."

Watch the Diana trailer here:

Lingering doubts over Diana stem from the criticism by heart surgeon Hasnat Khan, who is played by Lost actor Naveen Andrews in the film. He slammed the film for being "completely wrong" and "based on gossip," though most, if not all of his credibility was lost after he admitted to never having seen the movie.

Now, the writer of the new movie Stephen Jeffreys tells the Evening Standard that Watts turns in an incredible performance, particularly in a scene recreating her infamous interview with Martin Bashir in 1995.

"In the Bashir interview, Naomi is brilliant. You can't tell the difference between the two of them," he says.

The speculation will die when Diana is released on September 20, 2013, whether the movie does too remains to be seen. 

Naomi Watts DianaNaomi Watts Walked Out Of An Interview With Mark Kermode and Simon Mayo