Carey first appeared on the live, count-down special in 2005. She made headlines last year when she returned, but was unable to sing after a vocal track reportedly malfunctioned and her earpieces failed.
"We can all agree that last year didn't go exactly as planned and we are thrilled to move forward together to provide America with an incredible night of music and celebration on Dick Clark's New Year's Rockin' Eve with Ryan Seacrest 2018. See you in Times Square!" Carey and dick clark productions said in a joint statement.
Also slated to perform in New York during the 5 1/2-hour program -- set to begin at 8 p.m. EST -- are Camila Cabello, Nick Jonas and Sugarland.
Ciara will host the Los Angeles portion of the broadcast, which will feature additional performances by Kane Brown, BTS, Kelly Clarkson, Fitz & The Tantrums, Florida Georgia Line, Halsey, Khalid, Shawn Mendes, Charlie Puth, Portugal. The Man and Hailee Steinfeld. Britney Spears will also sing from The AXIS at Planet Hollywood Resort & Casino, making it the first television performance of 2018 on ABC and the end of her Las Vegas residency.