Associated Press: Madonna, Rihanna and Sam Smith will perform at the second annual iHeartRadio Music Awards this month. Iggy Azalea, Florida Georgia Line, Jason Aldean and Meghan Trainor will also hit the stage on March 29 at the Shrine Auditorium in Los Angeles, Jamie Foxx will host the awards show. The three-hour event will air live on NBC and iHeartMedia’s radio stations.