Performers also include Brantley Gilbert, Ella Henderson, Nick Jonas, Nico & Vinz, Train, Iggy Azalea, Bastille, Charli XCX, Jason Derulo, One Direction, Pentatonix, Rixton, Meghan Trainor, Taylor Swift, Florida Georgia Line, MAGIC!, Gavin DeGraw, Lady Antebellum and Elton John. Menzel is scheduled to perform the Oscar-winning "Frozen" anthem "Let It Go."

The bi-coastal celebration includes hours of special performances and reports on New Year’s celebrations from around the globe.

Seacrest leads the traditional countdown to midnight from Times Square in New York City. Jenny McCarthy reports live from Times Square, and Fergie hosts the Billboard Hollywood Party.

The complete lineup for Dec. 31 on ABC follows:

8 PM-11 PM – “Dick Clark’s Primetime New Year’s Rockin’ Eve with Ryan Seacrest 2015”
11:30 PM-1:09 AM – “Dick Clark’s New Year’s Rockin’ Eve with Ryan Seacrest 2015, Part 1”
1:10 AM-2:13 AM– “Dick Clark’s New Year’s Rockin’ Eve with Ryan Seacrest 2015, Part 2”