He's funny. He's charming. And he can sing!
Ladies and gentlemen, it's Mr. Conan O'Brien!!!
The late night host was joined onstage by Nick Offerman aka Ron Swanson and also Patton Oswalt who plays the voice of the rat from Ratatouille.
The performance was produced by Story Pirates which pairs kids with A-list actors to create a dazzling and amazing show.
At the end of the performance, Alejandro asked Conan if he liked acting in the piece.
Here's what Conan said:
"Oh i loved it. this was the best writing that I've worked with in a long time. Seriously."