The ball is atop the roof of 1 Times Square on Broadway between 42nd and 43rd streets.
Crews are installing 192 new Waterford crystal triangles on the iconic ball that will drop at the stroke of midnight.
This year's design is entitled "Gift of Happiness" and weighs more than 11,000 pounds and is 12 feet in diameter.
RELATED | Jennifer Lopez to headline 'Dick Clark's New Year's Rockin' Eve' 2021 on ABC
J. Lo will headline "Dick Clark's New Year's Rockin' Eve" on ABC, performing in Times Square right before the ball drop that will usher in 2021.
Billy Porter, who will pull double duty as a host, is slated to reunite with Cyndi Lauper for a duet performance in New York. The two previously collaborated on the Broadway hit "Kinky Boots," for which Lauper wrote music. Machine Gun Kelly and Jimmie Allen will also perform in Times Square.
Additional performers include Nelly, Miley Cyrus, Megan Thee Stallion, Doja Cat, Maluma, Ella Mai, Lewis Capaldi and Brandy.
Don't miss "Dick Clark's New Year's Rockin' Eve with Ryan Seacrest 2021" on ABC beginning at 8 p.m. ET | 7 p.m. CT on Thursday, Dec. 31
RELATED | 2021 numerals arrive in Times Square ahead of New Year's Eve
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