When it comes to bringing the cuteness, this couple has got our stamp of approval!

Gwen Stefani joined her boyfriend Blake Shelton for another surprise onstage duet, this time at his concert Friday at The Forum in Los Angeles. The venue and show opener and The Voice alum RaeLynn posted pics of the two.

They sang their 2016 duet "Go Ahead and Break My Heart" and also celebrated backstage—along with friends, her three sons and her brother and sister-in-law's kids.

Gwen Stefani, Blake Shelton, The Forum, Concert

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As seen in videos and photos Stefani posted on Snapchat, the backstage party included a giant mural of the couple, while people also got stamps of caricatures of their faces. A Hansen's Cake with the words "A Cake for Blake" was brought out. The adults also enjoyed JELL-O shots.

Gwen Stefani, Blake Shelton, The Forum, Concert

Instagram

Gwen Stefani, Blake Shelton, The Forum, Concert

Instagram

Gwen Stefani, Blake Shelton, The Forum, Concert

Instagram

Gwen Stefani, Blake Shelton, The Forum, Concert

Instagram

Gwen Stefani, Blake Shelton, The Forum, Concert

Instagram

Gwen Stefani, Blake Shelton, The Forum, Concert

Instagram

Stefani and Shelton began dating in late 2015 and have often hung out with each other's family members, who are from California, and his, who are from Oklahoma.

They have performed together onstage several times and often join each other on tour. Last month, Shelton brought out Stefani as his surprise guest at Luke Bryan's Crash My Playa event in Mexico, where she sang her band No Doubt's 2001 hit "Hella Good."

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