Gwen stole the spotlight wearing a white off-the shoulder chiffon gown. She completed her angelic look with her blonde tresses styled in Old Hollywood curls and understated makeup -- we've never seen the 46-year-old look better!
And we're not alone!
Stefani's new beau and co-star Blake Shelton also gushed about her look while talking to Entertainment Tonight before the live show.
"Wait 'til you see," he said about Stefani's outfit. "I saw what she's going to be wearing for this performance tonight, it's stunning. It's so beautiful."
Shelton also revealed why he's thankful for his new lady love.
"I'm thankful for Gwen for tons of reasons," the "Sangria" singer confessed, "but mostly because she makes us all look a whole lot better on this show."
What do you think about Gwen's performance and Blake's reaction? Tell toofab in the comment section below and check out the gallery above to see more of Hollywood's hottest celebrity couples!