Kung-Fu Panda is getting into its full-on promotional ahead of its release in the US tomorrow (we don’t get it in the UK until next month) and Jack Black appeared on the David Letterman show last night talking about the new film, his new son and his new exercise routine.

On the subject of Jack’s son, he’s revealed that the two week old boy is actually called Thomas (known as Tommy), not Jack as previously thought.

He explained recently: “I said I named the baby after me. I didn’t say that my actual name is Thomas.”