Five-year-old Kai Langer has won over plenty of fans ever since his adorable Bruno Mars performances went viral, and this week, he stopped by Ellen DeGeneres's show to bring down the house with an impossibly cute rendition of Katy Perry's "Roar." This isn't Kai's first time meeting Ellen, though. After a video of Kai's singing went viral last year, the sweet little boy stopped by Ellen's show to give her an in-person performance of "Grenade" by Bruno. Days after that appearance, Kai ended up on the same plane as Bruno and he was able to sing for Bruno, too. Watch Kai perform Katy's song above, then check out his past appearances on Ellen's show below.
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