Their unexpected duet not only set the tone for the rest of the night, it also catapulted Shelton onto cloud nine. With a wide grin, the \"God's Country\" singer bellowed into the microphone following Stefani's stage exit, \"Are you kidding me?! I'm telling y'all the show is just now beginning!\"

Stefani later thanked her \"best friend\" for letting her crash his set and for allowing her to wear her glitter cowgirl attire complete with thigh high sparkle boots. The jacket also had \"Blake\" embossed on the back.

View this post on Instagram

@blakeshelton thank u for having me on your @theforum stage and giving me the opportunity to wear denim and diamond Fringe with a unicorn ponytail 🦄 @officialdanilohair @danielxdiamond #neverinmywildestdreams #nobodybutyou 2020 Gx

A post shared by Gwen Stefani (@gwenstefani) on Mar 8, 2020 at 10:11am PDT

In a separate post, the \"Hollaback Girl\" singer posted a set of photos from backstage of the happy couple hanging out with her sons, Kingston and Zuma.

View this post on Instagram

@blakeshelton #friendsandheroestour #nobodybutyou Gx

A post shared by Gwen Stefani (@gwenstefani) on Mar 8, 2020 at 12:22am PST

Shelton and Stefani first began dating in 2015 following their respective divorces from Miranda Lambert and Gavin Rossdale.

Shelton is currently on his Friends and Heroes tour, which wraps Sept. 12 in Louisville, Kentucky.

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