Naomi Watts is playing the late Princess Diana in a new Oliver Hirschbiegel-directed biopic, creatively titled Diana.

Watts appeared on The Ellen Degeneres Show yesterday to discuss her part in the film and admitted that portraying the princess was "high pressure."

"I tried to say no, but I guess every time I said no, I rang back up and said I changed my mind," the 44-year-old star explained. "I think it's just the pressure because we all feel we know her so well. The pressure of that is scary because everybody thinks, oh, you're not the right look or whatever…"

Here she is talking about playing Diana:

And here she is talking about her husband and how he straps their kids to his bike:

DailyStyle