Lily Allen joined her best friend Kate Moss on her carefree holiday in St. Tropez, France. Soaking up the sun on a luxury yacht, the two showed off their trim bikini bodies. Apparently, Lily’s been gettind dieting advices from her supermodel friend: “Kate’s been telling her to try the “rock chick” diet – coffee, cigarettes, vodka and champagne, which are relatively low in calories.” a source told the DailyMail.