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(TMZ) - NBC just realized Mariah Carey is worth it ... because they have now booked her to perform live tonight ... this after pulling the plug on her Tuesday night, reports TMZ.

TMZ broke the story that Mariah showed up more then 3 hours late for a taped performance that was supposed to air during the Christmas tree lighting ceremony Wednesday night in Rockefeller Center. According to TMZ, She was delayed because she was talking with her lawyer about the divorce settlement with husband Nick Cannon. 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, according to TMZ. It's interesting ... the decision comes after LeAnn Rimes tweeted that she would have more air time, insinuating it was because of 'the Mariah problem.'

But the country singer changed her tune now that Mariah's back in.

The tree lighting ceremony just got more interesting.

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