This might be the sweetest video we have seen all week! 5-year-old Kai Langer, aka the most adorable little kid on the planet, stopped by the 'Ellen DeGeneres Show' to chat with the host and show off his rendition of Katy Perry's anthem, 'Roar.'

The fedora-clad little boy, who famously covered Bruno Mars on a previous episode of 'Ellen,' was seriously too cute for words as he passionately belted out the tune. Little Kai took the performance seriously, carefully emphasizing each note with strong hand movements -- but not forgetting to smile when the song called for it. His enthusiasm for the tune is not only endearing, it's admirable. Every artist should be putting as much passion and energy as he does into his performance!

Aside from being the sweetest little singer we've ever seen, Kai is just adorable all around. When DeGeneres talked to him about his soon-to-be big brother status, Kai announced that if his new sibling is a girl, he would want to name her "Dad." But if it's a boy, he'd name him "Zoo," considering it's a word that he can spell. Holy cute.

Watch Kai Langer cover of Katy Perry above -- and prepare to have your heart melted into a puddle!