Christina Aguilera Joins Chappell Roan for “Coffee” at Super Graphic Spectacular in LA: Watch

"From the moment I heard Chappell's voice, I knew she was a force to be reckoned with, and I became an immediate fan," Aguilera told the crowd. Christina Aguilera Joins Chappell Roan for “Coffee” at Super Graphic Spectacular in LA: Watch Paolo Ragusa