United Kingdom, Dec. 28 -- Erin Doherty used to order coffees in Anne, Princess Royal's regal voice to see how people reacted.

The 33-year-old actress - who played a teenage version of the 75-year-old royal in seasons three and four of Netflix's The Crown - relishes finding out how her different alter egos fit into different social situations.

Erin told The Observer Magazine: "I remember ordering coffees in a Princess Anne voice because I was like, 'I'm just going to see if this whole interaction changes.' And it was massively different, which was interesting.

"Without being stereotypical, it got to me way quicker. My coffee was in my hand."

Asked why Erin thought she was made a priority at the coffee shop, the star responded: "There'...