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The singer was one of a few stars on hand when NYC Mayor Michael Bloomberg flipped the switch to light up the 45,000 multi-colored LED Christmas lights on the 76-foot Norway Spruce.
See all the photos from this event, including Miss Universe 2013 Gabriela Isler, "Today Show" co-hosts Savannah Guthrie and Natalie Morales here.
See all the photos from this event, including Miss Universe 2013 G...
More than 1,000 fans swarmed the venue to catch a glimpse of the singer, who arrived in a white 1958 Chevy Impala convertible and wore a sequined black gown on the red carpet.
Dancers, contortionists and acrobats marked Spears' arrival, and she took time to sign autographs for fans, many of whom carried "Happy Birthday" banners for the pop star, who turned 32 on Monday.
"In Vegas! Celebrating #BritneyJean & #PieceOfMe with my new Vegas family. :)" ...