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However, at the end of the performance, Shelton, 43, told everyone: “Say stace, everybody, we love you." The country music crooner quickly acknowledged the blunder as Stefani burst into laughter and leaned onto his shoulder.
Stefani, 50, couldn't help but share the hilarious moment on Instagram, captioning the clip:" #saysace Gx @blakeshelton."
It's clear quarantining at home together hasn't put a damper on the romance between the pair as their chemistry couldn't be denied during the performance.
"We happen to be in Oklahoma, hiding away from everybody, doing what we're supposed to do. And, we're also doing what I think everybody else must be doing, which is... drinking all day," Shelton joked.
Along with singing in Sunday's special, the couple has been having fun during self-isolation, with Stefani recently giving her boyfriend a haircut, which caused quite the stir.
"Quarantine mullet update 3/26/2020..." he wrote on Twitter alongside a clip showing off his new hairstyle. "@gwenstefani has decided to take it to the next level.. Stripes."
Fox News' Jessica Napoli contributed to this report