Harry Potter star Emma Watson has once again signed up to play a schoolgirl. The 17-year-old talented actress will now be seen on the silver screen playing orphaned girl Pauline Fossil in the BBC's adaptation of Noel Streatfeild's 1936 novel "Ballet Shoes."Set in 1930s London, "Ballet Shoes" tells the story of Fossil and her two sisters who are adopted by an eccentric explorer, to be played by Richard Griffiths, known for his role as a teacher in "The History Boys.""Silent Witness" actress Emilia Fox and British comedian Victoria Wood would also appear on the show due to be screened on BBC1 later this year.