Talk about relationship goals! On Wednesday, Gwen Stefani took to Instagram and uploaded a cute couples' selfie featuring boyfriend Blake Shelton, Adam Levine, and his wife, Behati Prinsloo. Along with the photo, which was most likely taken on the set of The Voice, Gwen simply wrote, "@behatiprinsloo @adamlevine @blakeshelton Gx 😘.." Earlier this week, Gwen and Blake took the Voice stage together and performed their duet, "Go Ahead and Break My Heart," for the very first time. Meanwhile, Behati and Adam have been busy gearing up for the arrival of their baby girl, and last week, the Maroon 5 frontman grabbed headlines when posted a hilarious shot of him and his wife showing off their matching bellies. See Gwen's post above now, and then check out her cutest photos with Blake.