A lot of if not most famous comedians tour all over the world. The country of one's origin doesn't seem to matter much as long as you speak a language your audience understands.
I remember seeing Eddie Izzard in Slovenia. The fact that he's from the UK, not from Slovenia, did not seem to detract one bit from his famous Darth Vader joke.
Russel Crowe is also a great example of a comedian that's pretty well known in the US, but who is in fact from the UK.