There's less than three weeks to go before Sophie Anderton prepares to run the Virgin London Marathon. However, the model couldn't resist a cheeky cigarette following a hard day at the gym on Tuesday. The former Gossard pin-up, 35, tweeted of her embarrassment after she spotted a paparazzo capturing evidence of her unhealthy slip-up. Busted! Sophie Anderton enjoys a cheeky cigarette after her gym session in London on Tuesday Oops: Sophie tweeted of her embarrassment after being caught in the act Sophie has technically given up smoking and has been on a major health kick while training for the 26 mile run on April 21. However, after a long workout, Sophie enjoyed a little puff off a friend's cigarette as they went to a pub in London. After realising she had been caught with a fag in her mouth, she tweeted: ' Just been caught leaving the gym by the paps. Fighting fit: The 35-year-old has been training hard for the Virgin London Marathon later th