Shelton, dressed in a black suit with a red guitar strapped around his neck, and Stefani, clad in a full-length gold dress, took the stage to perform their new duet, "Go Ahead and Break My Heart." Stefani co-wrote the song.

Fans couldn't get enough of the romantically charged performance.

>> PHOTOS: 2016 Billboard Music Awards red carpet

>> PHOTOS: Scenes from the 2016 Billboard Music Awards

>> PHOTOS: Best dressed: 2016 Billboard Music Awards

>> PHOTOS: Worst dressed: 2016 Billboard Music Awards

"The way Blake looked at Gwen when she's singing!! LOVE!" wrote Twitter user @danielleliu0518.

>> Read more trending stories

"Gwen & Blake haven't taken their eyes off each other," @GagaNoir wrote.

– The Cox Media Group National Content Desk contributed to this report.

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