It's Chew-lisa! X Factor's new judge Ms Contostavlos reveals new £12,000 teeth as part of makeover for showBy Jody ThompsonShe's always been known as something of a gobby pop star - but N-Dubz singer Tulisa Contostavlos has now quite literally put her money where her mouth is.The new X Factor judge has apparently splashed out £12,000 on a gleaming new Hollywood smile - just like Cheryl Cole did