Britney Spears' often-maligned husband KEVIN FEDERLINE's debut single POPOZAO was a joke, according to the dancer/rapper. Federline claims he released the track to capitalise on the fact people were laughing at him - but he got the last laugh as the curious flocked to his website to hear the tune. He says, "At first, when I put out PopoZao, people were kinda laughing at me. I did it on purpose so people would look at me exactly the way they did. "That way, when I come out with my real s**t, people are f**king blown away."