Remember that little boy named Kai? Check out the video of Bruno Mars singing with his biggest little fan.

In case you don't remember, Kai is the cute little boy that Ellen took a liking to for singing Bruno Mars' songs on YouTube. Check out what started it all below.

He's appeared on Ellen several times since, but this time he got to sing with his idol. He was a little shy at first, but who wouldn't be. I'm grown and I would be shaking in my boots if I had to sing a Bruno Mars song in front of him.

Good job Kai!