The musical couple shared a photo of them kissing under some strategically-placed mistletoe on the No Doubt artist's Instagram story Christmas Eve.
The Voice coach looks casual in jeans and a black sweater in the snap, while Stefani rocks a black top, festive skirt and high bun.
The rocker also got kisses from her three sons, whom she shares with ex Gavin Rossdale, 11-year-old Kingston, 9-year-old Zuma and 3-year-old Apollo.
In a precious Christmas moment, Stefani quizzes her youngest on what the mistletoe tradition actually is.
"Do you know what this is?" she asks her son about the mistletoe, who responded, "It's a kisser?"
“Somebody that is funny and has a sense of humor is sexy — that’s the No. 1 thing," she said. “[He’s] somebody that is at the top of their game and talented and genuine and cool and generous and just not self-aware at all — completely a man."
Stefani noted that despite his talents, the sexiest thing about Shelton is his heart.
“It’s interesting because I don’t think any of those things like beauty or sexy or whatever way you want to describe humans is necessarily a physical thing that people are attracted to,” she explained. “It’s all about the heart, and he has that big
She added that Shelton doesn't even know how good-looking he really is.
"He doesn’t even know how cute he is," she said. "[He]’s cocky but only because he’s a cowboy!"