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On Wednesday night, the 80-foot Norway spruce in New York City's Rockefeller Center was lit.
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The tree was covered in more than 45,000 LED lights...
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...and topped with a Swarovski crystal star.
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Thousands of New Yorkers and tourists came out to watch the ceremony.
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The NYPD were on call for crowd control.
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Cee Lo Green performed.
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And, of course, the iconic Rockettes.
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The tree will remain lit until Jan. 7.