As the capstone performance to a four-year residency in Las Vegas, Britney Spears will join the lineup for "Dick Clark's Rockin' New Year's Eve With Ryan Seacrest 2018" on Dec. 31.

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Spears' performance will be broadcast live from Axis Theater in the Planet Hollywood Hotel and Casino, where the GRAMMY-winning pop diva has held court in Las Vegas since 2013.

The five-and-a-half-hour broadcast will feature separate countdowns in Los Angeles and New Orleans, respectively hosted by Ciara and Lucy Hale, along with the main countdown broadcast from New York's Times Square, anchored by Ryan Seacrest and Jenny McCarthy.

The gathered crowd of more than one million partygoers in Times Square will be treated to live performances by Camilla Cabello, Nick Jonas and Sugarland, and throughout the evening additional performances by K-pop sensations BTS, Kelly Clarkson, Fitz & The Tantrums, Shawn Mendes, Charlie Puth, Portugal. The Man, and more will be streamed from Los Angeles, along with collaborative performances by Alessia Cara and Zedd, Khalid and Marshmello, Hailee Steinfeld with Alesso, and more.

The countdown in New Orleans will feature additional performances by Imagine Dragons and Walk The Moon.

This year's installment of "Dick Clark's Rockin' New Year's Eve With Ryan Seacrest" will kick off on Dec. 31 at 8 p.m. EST on ABC.

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