London, (ANI): Britney Spears has starred in the latest adverts for American fashion brand Candies. And the pop-star with a troubled past looks slim and radiant in the pics for the campaign.However, a short time later, the 28-year-old pop princess appeared tired and podgy, with greasy unwashed hair, while out on a shopping trip in Beverly Hills, California.Recently, fellow songstress Ke$ha, 23, blasted Britney on her new single Styrofoam, singing: ldquo;In 10 years, Britney Spears sbquo; Britney who? ldquo;She looked a bit tired but bear in mind shes a young mum juggling parenting and a showbiz career. Cut the girl some slack! the Daily Star quoted a Britney fan as saying.