Usher and Justin Bieber

Video: Justin Bieber Performs with Usher and Jaden Smith at Grammys

Best New Artist nominee Justin Bieber made his Grammy debut with some help from his mentor Usher and fellow teen sensation Jaden Smith. The 16-year-old heartthrob strapped on a guitar for “Baby” before kicking things into high gear with the theme from his box office smash Never Say Never. Ninjas came down the aisles and Jaden Smith emerged from a trapdoor to bust a rap. Ursh came back in blue to deliver his smash “OMG,” trading fancy footwork with the Biebs for the finale.