Actress Naomi Watts, who will be playing Princess Diana in the upcoming biopic, recently walked out of an interview, seemingly pissed with the questions asked.

However, host Simon Mayo has no clue as to what made her act like that. He even tweeted this news saying, "A first for me... As Naomi Watts walked out of an interview! She seemed a tad uncomfortable with the questions. Shame."

Directed by Oliver Hirschbiegel, the film will essay the last two years of the life of Diana, Princess of Wales.

The interview will go on air next week.