According to TMZ, NBC have now booked Mariah Carey to perform live tonight after pulling the plug on her Tuesday night. TMZ broke the story that Mariah showed up more than 3 hours late for a taped performance that was supposed to air during the Christmas tree lighting ceremony Wednesday night in Rockefeller Center. She was delayed because she was talking with her lawyer about the divorce settlement with husband Nick. When she finally showed up, frustrated NBC execs sent her packing. But, NBC had a change of heart and they are now rolling the dice that she will show up tonight. The decision comes after LeAnn Rimes tweeted that she would have more air time, insinuating it was because of 'the Mariah problem.