Lady Antebellum have joined the lineup of performers on the Grammy Awards airing live from Los Angeles on Feb. 13 on CBS. They are nominated for six Grammys, with three nods in categories across all genres -- album, record and song of the year. Last year, they won a Grammy for "I Run to You" in the category of best country performance by a duo or group with vocals. Other newly-announced performers include Justin Bieber, B.o.B., Bruno Mars, MonÃ¡e, Muse, Jaden Smith and Usher. As previously announced, Miranda Lambert will also perform at the Grammys, along with Arcade Fire, Eminem, Cee Lo Green, Lady Gaga and Katy Perry.