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Watch: Stars sing at tree lighting events in San Francisco, New York

Grammy nominated singer/songwriter Carly Rae Jepsen sang to her fans at the lighting of the holiday tree at 555 California Street in San Francisco on Tuesday.

And singer Mariah Carey performed for the 81st Annual Rockefeller Center Christmas Tree Lighting in New York City.

Read: NYC's Rockefeller Center Christmas tree will be lit tonight.