Marc By Marc Jacobs, look-a-like?

After a long search on the web I found these ads of Marc by Marc Jacobs. I've seen these numerous times in magazines and everytime I see this man, I think of Mister Jacobs himself. I'm sure you guys have noticed it too. Is it a look-a-like or is it jacobs himself??? No I don't think so or his little brother if he has one:P... (I'm confused). I'm quite curious why he has done this.◆

F.S