The 22-year-old singer performed his hit “Jealous” at the annual event.
Olivia, also 22, was a former Miss Universe and left little to the imagination with her head turning dress from MT Costello.
“It’s happening right now! Tune into @nbc to watch The @MissUniverse pageant! I’ll be performing during the evening gown competition,” Nick reminded fans on Twitter before the show.
10+ pictures inside of Olivia Culpo and Nick Jonas…