Jaden Smith will perform alongside Justin Bieber and Usher, with whom he collaborated on the song “Never Say Never,†at the Grammys this year. Naturally. And joining already-announced performers Lady Gaga and Eminem are B.o.B, Bruno Mars, and Janelle Monáe, who will be performing as a trio. Muse and Lady Antebellum have also been announced as performers, but those two will not be performing together. [MTV]