The annual ABC television special added the singers and several other acts to its Hollywood party lineup in a series of tweets Monday.
"2019 is the year to level up! We're so excited that @ciara is performing on #RockinEve from the Hollywood Party, 12/31 at 8/7c on ABC," the New Year's Rockin' Eve official Twitter posted.
Halsey, Shawn Mendes, Weezer, Kane Brown, Bazzi and Lauren Alaina will also take the stage at the event Dec. 31 in Los Angeles. Ciara will host the party, with Ryan Seacrest to host the New York bash.
"#RockinEve will never be the same after @Camila_Cabello takes the stage from the Hollywood Party," the show tweeted.
Dick Clark's Rockin' New Year's Eve previously announced The Chainsmokers, Charlie Puth, Kelsea Ballerini, Dua Lipa, Ella Mai, Foster the People, Macklemore and Skylar Grey as Hollywood party performers. In addition, Post Malone will kick off 2019 with a performance in New York.
Seacrest took over as host of Rockin' New Year's Eve from Dick Clark in 2005. He has yet to announce other performers besides Post Malone for the New York bash.