The 31-year-old 'Halo' hitmaker, who was singing at the Gwinnett Center in Atlanta, criticised a fan for taping her instead of singing, reported Daily Mirror.
"See, you can't even sing because you're too busy taping. 'I'm right in your face baby, you gotta seize this moment baby! Put that damn camera down," she said to the fan.
Following which he ceased to film her and began to sing. To which she responded by saying, "Yes, that's much better.