The 47-year-old singer discussed her professional dynamic with the 40-year-old country star on Wednesday's episode of the "Today" show, saying her work life with Shelton is "easy and comfortable," not "awkward."
"[I love] the chemistry between the coaches!" Stefani said.
"Alicia Keys is just so magical. Adam [Levine] and I, we've known each other now for a while. And, of course, Blake, who I think is the greatest guy ever. It's just so fun. It's so easy and comfortable."
"[Working with Blake made me] nervous at first. I was like, 'Wait is this going to be awkward? How am I going to act?' It's just natural," she shared. "We actually do help each other, and I've learned a lot about country music -- just in the last year -- through him."
The couple was apart Tuesday for Valentine's Day, but still managed to connect.
"He forgot [to call]," the singer joked before sharing, "I got some beautiful flowers and lots of texts. It was fun."
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Stefani and Shelton will both serve as coaches on "The Voice" Season 12, which premieres Feb. 27 on NBC.
The singer previously served as a coach in Seasons 7 and 9, while Shelton has been with the show since Season 1.
"It's so good. It's just a different perspective being back and listening to all the music, and I have such an amazing team," Stefani told Access Hollywood. "I love [Adam Levine], and I love Alicia Keys, and obviously, I love Blakey. It's just so fun. I love it here."
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