The history of pop icons attempting to make it in Hollywood is a long and often sad one. Cher was a big success, with Jon Bon Jovi looking good for the future, while the likes of David Bowie and Mick Jagger have made many a sorry attempt to cut it. The world of rap has a far better record of producing film stars. Tupac caused a major stir before his untimely death, LL Cool J's star is rising, as is Queen Latifah's. And then there's the biggest of them all - Will Smith, formerly known as The Fresh Prince, surely the most successful crossover star of the modern era...