Hollywood Holidays -- Entertaining

'Tis the Season! Celebs Spread Holiday Cheer

Blake Shelton! Mariah Carey! Taylor Swift! See who's got enough spirit to be Santa's helper

MARIAH CAREY

She's Santa's little helper! The singer turns the Big Apple into the North Pole on Nov. 27 to help celebrate the next day's lighting of the Rockefeller Center Christmas tree. "Let the festivities begin!" she Tweeted.