Gwen Stefani is definitely proud of her new song with boyfriend Blake Shelton. The No Doubt singer gushed over working with Shelton on “Go Ahead and Break My Heart,” the second single from his forthcoming album “If I’m Honest,” and about performing the track together on NBC’s “The Voice.”

“That feels crazy. That feels extreme,” she told E! Online about collaborating with Shelton. “Yeah … It feels like, ‘Wow, that happened.’ I can’t believe I wrote a song with that guy.”

She continued, “And then we got a chance to sing it together on ‘The Voice.’ Like … and everyone got to see that. It was a miracle. It was incredible.”

Stefani and the “Sangria” singer will take the stage together once more to perform the song at the 2016 Billboard Music Awards next Sunday.

Stefani isn’t the only one who really loves the duet. Shelton dished on co-writing the song, telling “Entertainment Tonight” earlier this month that the song is “as good of a song as I’ve ever written in my life.” He added, “[It’s] a full blown duet … It’s a 50/50 performance.”

Shelton previously explained that writing the song with Stefani was special — and rare — because he doesn’t usually write with other people. “[The song] is very personal for us both because, you know, we obviously have this bond that is remarkable together,” he told “Entertainment Tonight” last month. “But the fact that we wrote a song together … I know that I don’t co-write that much because I’m very insecure about it, I guess and [Gwen’s] kind of got her circle of people that she writes with. But for us to reach out to each other as writers, it may never happen again, who knows.”

Shelton’s album, “If I’m Honest,” will be out May 20.