Keri Hilson and Bruno Mars have been tapped to perform on the magenta carpet during the NBA All-Star pre-game show, while Rihanna will take the stage at halftime. The “Grenade” singer will link up with Miss Keri at the players showcase, set to be hosted by Nick Cannon from Los Angeles’ Staples Center. Meanwhile, RiRi shared her excitement in celebrating her 23rd birthday by holding it down as the sole halftime performer. “YES!! I get the entire halftime show @ NBA All-Star Weekend,” tweeted the Bajan beauty. The 2011 NBA All-Star Game will air live on Sunday, February 20, on TNT.