Justin Bieber, Bruno Mars, Muse Added To Grammy Show

Usher, Jaden Smith, B.o.B, Janelle Monae and Lady Antebellum will also perform on February 13.By Gil Kaufman Justin Bieber and Usher Photo: Kevin Mazur/ WireImage While Willow Smith is the one who made music headlines with "Whip My Hair" last year, it's her brother, "Karate Kid" actor Jaden Smith, who will take the stage at the upcoming 53rd Grammy Awards in a special performance