Holiday cheer is spreading from coast to coast! Thousands of people lined the streets of midtown New York to catch a glimpse of the tree lighting at Rockefeller Center (this year it's an 80-foot Norway spruce topped with a Swarovski-crystal covered star!) as Cee Lo Green, Mariah Carey, and Tony Bennett helped ring in the festive occasion. Meanwhile, in Los Angeles, musicians Cody Simpson and Barry Manilow lent their soothing voices to the L.A. LIVE’s in Nokia Plaza festivities, where a 66-foot artificial Sequoia tree went aglow. Click through the gallery to see more holiday tree lightings, pretty store windows, and more!