Singer Charli XCX has reportedly withdrawn from performing at this year’s BRIT Awards on March 1 at the O2 Arena in London. The Apple and 360 hitmaker has pulled out of appearing at the televised awards event because she is also due to appear onstage at the Grammy Awards on Sunday 2 February in Los Angeles, according to a source. The source said: "Charli's team had been in negotiations with the BRITs for months and she was set to perform on the night. But she's decided it didn't feel right and