Lovebirds Gwen Stefani and Blake Shelton Surprise-Sang Together in L.A.

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Couples that sing together, stay together, right? If so, it appears Blake Shelton and Gwen Stefani are going stronger than ever, as they performed a surprise duet at Shelton's concert last night.

Shelton and Stefani met as coaches on season seven of The Voice, and since then, they've quickly become one of music's biggest power couples. Last year, they recorded "Go Ahead and Break My Heart" together for Shelton's album, and their lucky fans at The Forum in Los Angeles were treated to a live rendition of the song yesterday.

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During the country singer's set, Stefani came out on stage to join him, wearing a black turtleneck and a metallic patterned mini skirt over fishnets and thigh-high black boots. Her platinum blonde hair was pulled back into a messy bun as she sang alongside her beau, who wore his usual blue jeans and button-down shirt.

Naturally, the crowd went wild for the surprise duet. It looks like Stefani was enjoying herself, too, dancing along to the music and gazing lovingly at her boyfriend.

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It's probably safe to say this can be added to the list of Gwen and Blake's cutest couple moments.