K-Fed Celebrates 30th B-Day in Vegas

For the second year in a row, Kevin Federline, ex-husband of Britney Spears and father of the pop star's two young boys, blew out the candles on his birthday cake inside the walls of Pure Nightclub in Las Vegas.

In addition to K-Fed's pals, one unlikely partygoer was his ex-girlfriend, and mother of his two other children, actress Shar Jackson. According to eyewitnesses, the wannabe rapper and actor appeared to enjoy himself with his posse of about 25 friends, including Mark Vincent Kaplan, his lawyer in the neverending custody battle with Britney.

While Kevin partied in Sin City, sources tell OK! his sons Jayden James and Sean Preston were under the care of a nanny back at his home in California.