That voice...
I just saw Dirty Filthy Love last night, and drove myself half mad trying to remember where I knew her voice from. I felt certain it was a cartoon, and even when I began to make the Harry Potter connection, I felt sure she was too old to have played Myrtle. Thank God for IMDb!
I love her voice, I'm surprised she hasn't done more voiceover work. She seems perfect for it.
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If you were me...you'd be good looking.