NBC and Dick Clark Productions announced Thursday that the Grammy-winning superstar will also perform at the May 1 event in Las Vegas.
Carey has 18 No. 1 hits, including "Vision of Love," ''Hero," ''Honey" and "We Belong Together."
Her duet with Boyz II Men, "One Sweet Day," spent 16 weeks at No. 1, making it the longest-running No. 1 hit on the Hot 100 chart. Luis Fonsi's "Despacito" tied the feat in 2017.
Kelly Clarkson will host the Billboard Awards, and Panic at the Disco, Sam Smith and Normani will perform. Cardi B is the leader with 21 nominations.
Copyright 2019 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.