It's time to Rock the Cradle! MTV is searching for the next superstar, but this isn't your average, every day singing competition. They are shining the spotlight on children of rock stars to see who has what it takes to step out of the parental shadow and fulfill their DNA destiny. Nine superstars in the making will step up to the mic to Rock the Cradle and prove they have what it takes to become the rock stars they were meant to be. They've got talent running through their…