Erin Doherty thinks Princess Anne is the “rock star” of the royal family. The 29-year-old actress plays the princess in the Netflix drama ‘The Crown’, and she admits that her real-life self is distinctly different to her on-screen character. She explained: “When I leave a meeting room or whatever, I’m the type of person who will walk back to the train station replaying every moment. I can’t let it go unless I’ve done that.” Erin admits that social media platforms, like Instagram, have intensified some of her worries. She told the Guardian newspaper: “That’s the scary thing about Instagram. It …