Watch the 'Stranger Things' Kids Slay 'Uptown Funk' Before the Emmys

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Caleb McLaughlin, Millie Bobby Brown and Gaten Matarazzo perform onstage during the 68th Annual Primetime Emmy Awards at Microsoft Theater on Sept. 18, 2016 in Los Angeles.

We already told you about the kids from Stranger Things having hidden musical talents -- well, they're not so hidden anymore.

The 'Stranger Things' Cast's Musical Talents: From Psych Rock to Broadway

At Sunday's Emmy Awards, before the TV cameras started rolling, Gaten Matarazzo, Millie Bobby Brown and Caleb McLoughlin from the hit Netflix series entertained the all-star crowd by taking over for Bruno Mars on Mark Ronson's "Uptown Funk."

Emmy Awards 2016: See the Full List of Winners

Some lucky Emmy crowd members caught all the untelevised action:


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