Lorde gave Sadie Sink the “Green Light” to absolutely let it rip during the singer’s show at the London O2 Arena on Sunday night (Nov. 16). The Stranger Things star was a surprise special guest during the first of two shows at the arena on Lorde’s ongoing Ultrasound world tour in support of her fourth album, Virgin.

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Video of the moment where the two women jam out like everyone is looking — bouncing around and flipping their hair, holding hands and shouting the lyrics to the ebullient lead single from Lorde’s 2017 s

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