Don’t let that “Father of the Year” award he received back in June fool you. Kevin Federline couldn’t care less about his kids, the short one and the dark haired one (his description, not mine). Federline missed his sons’ birthday party over the weekend in L.A. because he was too busy partying in Las Vegas. A source told MSNBC:

“On Friday night he went to the Lavo [nightclub] preview party, even danced to Britney’s ‘Gimme More’ and had so much fun that night he decided to stay for Saturday’s grand opening. Saturday he spent the day by the pool, then had dinner at TAO and hit the Lavo grand opening, red carpet and all, where he partied ’til 4am.”