The 'Hollaback Girl' hitmaker previously coached on three separate seasons of the US singing competition, and after Maroon 5 frontman Adam decided to step down from his role as a coach after 16 seasons on the show, Gwen is returning to fill his place when Season 17 airs later this year.
And now, Gwen's boyfriend Blake - who also coaches on the show, alongside John Legend and Kelly Clarkson - has praised her as the perfect replacement for his good friend Adam.
He said: ''Having her there, selfishly for me, made me happy, and I think it kind of saved the show with Adam going away, because there's no way around it: It sucks not having Adam there. I mean, he's just a major part of that show and my favourite person to kick in the nuts.''
Blake and Gwen, 49, met on the show back in 2014, and the 43-year-old country star - who is the only judge other than Adam to have coached on all 16 seasons - is pleased with her return because it made him ''feel better'' to replace Adam with someone who is ''familiar'' with the programme.
He added during a press conference in Nashville, Tennessee: ''She's familiar with it and gets it, and that made me feel better because that show is a complicated thing. When you're a coach on there ... and at the same time you're also supposed to be entertaining the audience at home, it's kind of a juggling act.''
Meanwhile, the 'God's Country' singer previously said he was ''upset'' when Adam announced he was leaving the show.
He said: ''I didn't expect it. I didn't expect Adam to pull the trigger like he did. ... We all knew he was getting to the point - it was 16 seasons he had been doing the show, and it's hard to keep him focused on anything. He was ready to move on. ... I was pretty upset that Adam was gone.''
American Thighs was released on this day in 1994.