The actress, who played Luna Lovegood in the Potter movie franchise, will team up with British actors Jamie Nichols and Stuart Brennan onstage at the Gaiety Theatre next month (Oct13).
The 22 year old tells the Irish Independent that it will be a "strange" making her stage debut at a theatre she has always loved.
She says, "Theatre was always something that's been in the back of my mind and my parents were really keen for me to do it; so the little girl in me just wants to make them happy. I've been to the Gaiety plenty of times, since I was five years of age, so it will be a bit strange to be up there, on the other side of things, actually on stage. But I'm looking forward to it and it's definitely something I'd like to do more of."