Machine Gun Kelly didn't waste his shot. The artist rocked Studio 8H in his debut appearance as the musical guest, and ended the episode by falling off the stage!In 's return after a long hiatus, the show tapped John Krasinski to host and Kelly to serve as musical guest, marking both stars' first times — and both seemed like seasoned pros.Krasinski kicked off the night with a rare appearance from a host in the Cold Open, playing Tom Brady, and then proceeded to kiss Pete Davidson in his monologue.
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