Naomi Watts walks out of Simon Mayo interview

Naomi Watts has walked out of an interview with BBC Radio Five Live's Simon Mayo and Mark Kermode.

The actress was in to talk about her portrayal of Princess Diana, in the new biopic 'Diana', but it seems that she wasn't much in the mood for it.

Tweeting about the incident, Mayo wrote:

@wittertainment is Mayo's partner on the Five Live movie show Mark Kermode.

When asked later why she left the interview, and it was suggested he might have implied the film was not in the best taste, he replied: “No, not at all. Didn't express any opinion. So still baffled.”

He joked to fellow BBC presenter Shelagh Fogarty: “The honest answer is I have no idea. You know my hectoring style is always a problem.”

Just what Mayo said that was deemed so offensive to the actress will most likely be unveiled during this Friday's show.

[Watts worried about royal reaction]

Watts' portrayal of the late Princess will most certainly come with some controversy attached to it.

She recently joked in an interview with InStyle: “I might go into hiding. I might have to leave the country.”

Perhaps it wasn't a joke after all...

She also recently spoke of how she had become fixated with the interview Diana conducted with Martin Bashir while researching the role.

The film, starring Watts as Diana and Naveen Andrews as surgeon Doctor Hasnat Khan, the man with whom Diana had an affair, is directed by Oilver Hirschbiegel.

It's due out on September 20.