Idol judge Simon Cowell has pointed his finely-tuned criticism at Britney Spears and Robbie Williams, slamming them for checking into rehab when there are millions of people suffering real hardship in the world. Cowell recently visited an impoverished country and, after bearing witness to the horrific living conditions there, says Spears and Williams have no idea what serious problems are. "This whole thing is a total indulgence. Britney and Robbie need to get a grip," Cowell says. "I don't ...