Josh Duhamel posted the sweetest video of his son, Axl, on Facebook on Thursday. The toddler, who laid on his dad's stomach, showed off his counting skills with a little help from Josh going from 1 to 7 and then jumping to 9. Axl wraps it up with "Kung!" in place of 10 before Josh starts singing "Twinkle, Twinkle Little Star." Watch the video above to see the adorable daddy-son moment.