Diary star joins Potter sequel

Work is underway on the second movie

Bridget Jones's Diary star Shirley Henderson is joining the cast of the second Harry Potter film.

Henderson, 35, will play teenage ghost Miserable Myrtle in Harry Potter and The Chamber of Secrets, set for release in November 2002.

She played Bridget's best friend Jude in the smash hit adaptation of Helen Fielding's novel earlier this year.

Shirley Henderson starred in Bridget Jones's Diary

Henderson will soon be seen in the forthcoming 24 Hour Party People, the story of seminal Manchester record label Factory, which is released in February.

Another casting, also revealed by the BBC's Newsround programme, is that of 12-year-old Hugh Mitchell who will play Harry's admirer Colin Creevey.

Meanwhile veteran actor Julian Glover - best known for playing a villain in Indiana Jones and the Last Crusade - will provide the voice of Aragog the giant spider, while Alfred Burke takes the role of former headmaster Armando Dippet.

The first film, Harry Potter and the Philosopher's Stone has topped the UK box office chart for the fifth successive week.

The movie has so far taken £46.9m since its release, making it the most successful film of the year.

But it is not expected to remain at top for another week, with the Lord of the Rings film opening on Wednesday.