As any self-respecting layabout-turned- failed-rapper- turned- custody-seeker would do, Kevin Federline has been working overtime to burnish the jaunty halo of responsibility he's placed atop his own head. His latest accomplice: One Tree Hill executive producer Mark Schwahn, who both compliments K-Fed on his two-episode guest stint and then tries to convince Us Weekly that he wasn't even aware of all the headlines — he just wanted that marvelous, talented bastard to grace his set: