Doctor Who star David Tennant and Sarah Harding, a singer with band Girls Aloud, have boarded the comedy St. Trinian's II: The Legend of Fritton's Gold.

The film is being produced and directed by Oliver Parker and Barnaby Thompson. Nick Moorcroft and Piers Ashworth penned the script.

The cast also includes Rupert Everett, Colin Firth, Gemma Arterton, Talulah Riley, Jodie Whittaker, Juno Temple, Tamsin Egerton, Celia Imrie and Fenella Woolgar, all of whom appeared in the first pic in the contemporary franchise, St. Trinian's.

The cast of St. Trinian's II: The Legend of Fritton's Gold, in which the pupils and staff of the anarchic girls' school engage in a hunt for treasure and a battle against a women-hating secret society, also includes up-and-coming thesps Ella Smith, Zawe Ashton and Montserrat Lombard.

The films are based on Ronald Searle's drawings, "The Girls of St Trinian's," which also inspired a series of laffers in the 1950s and 60s, which starred Alistair Sim, Joyce Grenfell, Sid James and George Cole.

The sequel started production Tuesday in and around London and at Ealing Studios.