Taylor Swift, Miley Cyrus and Sugarland have been added to the lineup of The 51st Annual Grammy Awards. Taylor and Miley will be performing Taylor's song "15" off her album Fearless. According to UsMagazine.com, it wasn't tough getting the best friends together for the duet. Taylor says, "We all came to the consensus, 'Wouldn't it be cool if Miley was up there too?' And she said yes, and we're really excited about it." The best buds and Sugarland join the list of previously announced performers including Kenny Chesney and Carrie Underwood. The 51st Annual Grammy Awards will air live from the Staples Center in Los Angeles Sunday at 8 PM, ET on CBS.