Machine Gun Kelly's epic musical film Downfalls High stars Sydney Sweeney (Euphoria, Handmaid's Tale), but how well did these two get to know each other while collaborating on his directorial debut? Watch the video to find out if they can pass our Co-Star Test... and you might even see MGK bang a gong (or two). #DownfallsHigh #MachineGunKelly #CostarTest
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