Evanna Lynch has joined the cast of 'Monster Butler'.

The 'Harry Potter' actress - who rose to fame thanks to her role as Luna Lovegood in the wizard movie series - will join Gary Oldman and Dominic Monaghan in the new crime thriller film.

The picture tells the tale of Roy Fontaine, also known as Archibald Hall, a bisexual serial killer and Jewel thief, and his descent into depression and eventual capture.

Evanna, who now lives in Los Angeles, will play the role of Fiona Carrick-Smith in the picture, discussing with her butler her worries about her forthcoming marriage, eventually leading to her creating a trail of destruction and betrayal.

The movie will begin shooting later this year.

Evanna previously revealed she would love to play troubled pop star Britney Spears in a movie.

She told BANG Showbiz: ''People laugh when I say this but I would love to play Britney Spears in a movie. She's complicated and I just relate to her. There are so many pop stars out there at the moment and I just think they've just got their image thing so planned to a T.

''Say, Lady GaGa, I like her and I like her music but I don't relate to her because she has this image and she's weird and perfect, whereas Britney is rich and cool and beautiful, but has also shown her vulnerable side and had a breakdown in front of the whole world.''