Justin Bieber dropped by the Ed Sullivan theater to help with David Letterman's Top 10 list on 'Late Show,' considering it was all about him. The topic was Top 10 Little Kown Facts about Justin Bieber, and the Bieb clearly had a blast pokin fun at his image.

We particularly loved the little turn of the head and smile he gave after delivering #7 on the list: "As hard as I've tried, I don't know how to not be adorable."

#5 had a great sight gag as well. After Bieber said, "I'm not really a big fan of Kevin James," the camera cut to James in the green room and he did a great sad sack expression.