A casting session is being staged at Pineapple Studios, Langley Street, Covent Garden, 10am - 3pm on Sunday.

Asian girls aged 13 to 16 are being invited to go along. Acting experience isn't necessary but the film-makers are being really strict about who they see.

They say people who don't match the descriptions will not be allowed in.

In the Potter books, the Patil sisters are twins.

The film-makers are interested in seeing twins and sisters, but they say the most important thing is casting two girls who have got good chemistry.

The Patil sisters have great roles in Goblet Of Fire - they are Ron and Harry's dates for the Yule Ball.

The filming starts next spring.