The Voice insider reveals what Gwen Stefani and Blake Shelton are really like to work with - and the key to their marriage!

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Gwen Stefani and Blake Shelton have put their love on display on The Voice, having met on the singing competition show in 2014, and going on to tie the knot in 2021.MORE: Gwen Stefani and Gavin Rossdale put on a united front at son Apollo's football gameBut is it the real thing?

Camila Cabello not only insists that they are as real as it gets, but she has also revealed what they say is the real key to making their long-lasting relationship work.The fellow The Voice judge, who has been witness to how Gwen and Blake work on and off the screen, spoke to Drew Barrymore on The Drew Barrymore Show about the couple, and what they're really like behind-the-scenes.WATCH: Gwen Stefani films epic bar inside home with Blake SheltonMORE: Gwen Stefani is a total punk princess in glitzy crop top amid shock family newsThe morning show host went straight for the info everyone wants, promptly asking her guest as they baked a chocolate cake: "What's it like to work with Gwen and Blake?"The former Fifth Harmony member was just as quick to gush about them, saying: "They are so adorable," and revealed that she actually looked to them for advice when it came to her own love life.Telling Drew that she had actually asked them what's the "key," having been together for so long and seeing them so happy, she further detailed: "They are so happy, and in love." The couple met on season seven of The VoicePlus, as the Charlie's Angels lead wondered: "Really?

It's real?" Camila confirmed: "It's so real."MORE: Blake Shelton supported by wife Gwen Stefani as he reveals he's leaving The Voice after 12 yearsMORE: Gwen Stefani looks so different in epic throwback photo with No DoubtShe added: "They're cuddly with each other, and obsessed with each other,".