She is currently on the set of the long-awaited St Trinian’s sequel in which she plays a cool new schoolgirl. Sarah, 27, sent temperatures soaring as she strolled about in a variety of skimpy schoolgirl outfits, hot pants, chunky biker boots or sandals, according to shot changes.
She is joined in the sequel, St Trinian’s 2: The Legend Of Fritton’s Gold, by Dr Who star David Tennant, who plays the film villain Pomfrey, part of a secret woman-hating society known as AD1.
The revival two years ago of the Fifties classic film comedies that featured Joan Sims and Barbara Windsor was a surprise hit, grossing £15 million at the UK box office, making it the third most successful independent British film ever after Four Weddings and a Funeral and Trainspotting.
The 2007 reworking, starring Russel Brand and a pre-Bond Gemma Arterton as head girl Kelly, was panned by the critics but film fans loved its slapstick fun.
Sarah had a cameo part in that film with her Girls Aloud bandmates. These latest pictures of her show Sarah looking super but she had to work hard to recover her health after ending up in hospital with crippling stomach pains just a couple of years ago.
A hectic lifestyle of clubbing every night had taken its toll and she was ordered to follow a strict diet of healthy food and to stop drinking alcohol.
A friend said: “There was nothing wrong, except overdoing it. Eventually you just have to give it a rest and she’s on top form now. This film is very hard work so it is just as well she’s on top of things and the new healthy regime is certainly paying off.”
The plot of the latest St Trinian’s sees the scantily-clad pupils on the hunt for buried treasure, after they discover that headmistress Miss Fritton, reprised by Rupert Everett, is related to pirates.
Also returning for another term are Colin Firth, Gemma Arterton, Talulah Riley, Jodie Whittaker, Juno Temple, Tamsin Egerton, Celia Imrie and Fenella Woolgar.
Co-director Barnaby Thompson said: “It’s a girls’ heist movie and how many times have you seen that? But it just clicks with girls, who enjoy the naughtiness and fun.”
It is being made in eight weeks at Ealing Studios, famed for classic comedies of the ’40s and ’50s.