Rihanna, Coldplay mix it upRihanna and Coldplay sing together on the group's latest album, and they'll do so again at the Grammy Awards, The Associated Press reports. Paul McCartney was announced yesterday by The Recording Academy as another performer on the Feb. 12 broadcast. McCartney is being honored as the MusiCares person of the year. His new album, "Kisses on the Bottom," will be released Feb. 7. Other performers include the Foo Fighters, Taylor Swift, Bruno Mars and Jason Aldean.