Emma Watson has been filming for a role as a schoolgirl in new BBC One drama Ballet Shoes.The 17-year-old Harry Potter star plays orphan Pauline Fossil in the adaptation of the 1936 kids' book.There's not too much change for Emma from her well-known role as Hermione Granger - she's wearing school uniform!The programme is going to be shown at Christmas time and tells the story of three orphans who are adopted by their uncle, who's a wacky explorer.Vote for your fave Harry Potter celebThe three girls all have their own dreams. Pauline (Emma Watson) longs to be an actress, Petrova (Yasmin Paige) yearns to fly aircraft and Posy (Lucy Boynton) seems born to be a ballerina.But when Great Uncle Matthew disappears, the money runs out - and the girls have a struggle on their hands.The book Ballet Shoes by Noel Streatfeild was first published in September 1936.