Kevin Federline paid to show up for his own birthday party?

Kevin Federline hit the thirty mark this weekend, celebrating in Las Vegas last night with his attorney and ex wife Shar Jackson.

K-Fed lounged in the Vegas club’s VIP section with his friends where he allegedly was drinking Jack, danced on the sofa and hoisting up a “FDRLINE” license plate.

According to inside sources for Gossip Girl, Federline may have been paid as much as $175,000 in appearance fees to show up at his birthday party.  Even making this much money, Britney Spears still gets stuck with the legal bills for the failed rapper.

TMZ posted a video of K-Fed trying to engage the crowd as he celebrated his birf-day, but the crowd booed and heckled the ex husband to Spears.  

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