Mariah Carey was so consumed with divorce talk Tuesday evening that she blew off her scheduled taped performance for the Rockefeller Center tree lighting ceremony and when she finally showed up the pissed off NBC honchos sent her packing. Sources say that Mariah was ensconced in her East Side hotel and spent most of the day talking with her lawyer on the phone about her divorce. When she pulled up to Rockefeller Center more than 3 hours late, she was still on the phone and people overheard her continuing to talk about her separation from actor Nick Cannon. NBC execs and the crew were reportedly enraged and Mariah’s people were told to just go home. Sources add that she really wanted to perform, but the network had clearly had enough.