Fedora-wearing singing sensation Kai Langer first gained fame when he was the 4 and appeared on the Ellen show to perform "Grenade" from his idol Bruno Mars. Kai was lucky enough to meet Bruno and go on to become fan favorite. Now Kai is back to do a colab with Bruno Mars.

There was a very special moment backstage on Ellen when Bruno Mars got to sing with his young fan. Kai jammed with Bruno on "Uptown Funk" and didn't miss a step!

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