Gwen Stefani says her boyfriend Blake Shelton is the "most incredible guy."

The 47-year-old singer couldn't help but gush about the 40-year-old country star on Tuesday's episode of "Late Night with Seth Meyers" while discussing "The Voice" Season 12.

"It's so unbelievable," Stefani said of serving as a coach with Shelton on the NBC reality competition.

"I love Blake. He is the most incredible guy. Everybody loves Blake -- there's no way around it. He's just a sparkly, happy, amazing person."

"I didn't even know that Blake Shelton existed in the world [before we met on 'The Voice']," she admitted. "It's interesting because, weirdly, my mom and my sister-in-law used to watch the show before me, so they did [know who he was]."

"Just being on the show is so magical," the star added.

"You're surrounded by music the entire time -- whether it's, like, picking songs for your team or listening to really talented people sing. It's just such an incredibly inspiring show, and it opened me up to new music, not just country."

Stefani and Shelton met on "The Voice" in 2014, and started dating the next year following their splits from their respective spouses, Gavin Rossdale and Miranda Lambert.

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The singer said on "Today" this month that working with Shelton on the series has been "fun"," not "awkward."

"[I love] the chemistry between the coaches!" she said. "It's just so fun. It's so easy and comfortable."

"[Working with Blake made me] nervous at first," the star confessed. "I was like, 'Wait, is this going to be awkward? How am I going to act?' It's just natural. We actually do help each other."

"The Voice" Season 12 will premiere Feb. 27 on NBC.

Stefani and Shelton will serve as coaches alongside Maroon 5 frontman Adam Levine and singer Alicia Keys.