David Tennant, the star of hit UK TV show Dr Who, and British popstar Sarah Harding have joined the cast of StTrinian’s II: The Legend Of Fritton’s Gold, which began principal photography in London today (July 6).The second St Trinian’s feature will be the debut film from producing and directing team, Oliver Parker and Barnaby Thompson.The cast also includes Rupert Everett, who will reprise his role as unconventional headmistress Camilla Fritton, Colin Firth, Gemma Arterton, Talulah Riley, Jodie Whittaker, Juno Temple, Tamsin Egerton, Celia Imrie and Fenella Wollgar, alongside newcomers Ella Smith, Zawe Aston and Montserrat Lombard. Harding, a member of girl brand Girls Aloud, appeared in the first St Trinian’s film in 2007.The film see the girls embark on a rollercoaster-style treasure hunt for the legendary Fritton’s Gold, which sees them face the villainous Pomfrey, played by Tennant, and his sidekicks from the women-hating secret society known as AD1.It is being produced by Everett Nigel Green, James Spring, Paul Brett, Tim Smith and Chris Smith. It has been written by Nick Moorcroft and Piers Ashworth. Entertainment Film Distributors will handle the UK distribution rights. It is being made in association with the Aegis Film Fund and Prescience.The first instalment of St Trinian’s grossed $25m at the UK box office.