No wonder Harry Potter star Emma Watson looks like a moody teenager bogged down with homework - she has gone straight from one school to another.The 17-year-old took time off as Hogwarts wizard Hermione Granger to play orphaned schoolgirl Pauline in a new BBC drama, Ballet Shoes.Speaking on her website Emma, who has already filmed her first scenes with Victoria Wood, said: "I really thought I was going to take the summer off...and then I fell in love with Ballet Shoes. I loved Pauline from the start. She makes mistakes and comes across badly at times, but I really felt as though I understood her. The cast is amazing and I can't wait to work with everyone."Set in London in the 30s, Ballet Shoes, which will be screened at Christmas, follows the ambitions of three orphans. And Pauline's is to be an actress Luckily, Emma doesn't need any of Hermione's magic to make her dream come true.